Base shift for input price indices Civil engineering from 2010=100 to 2015=100

# 4. Results

The above changes in the price indices used and the weights of the cost items, types of work and areas lead to differences between the civil engineering price indices based on 2015=100 and those based on the old 2010 reference year. This section provides an overview of the series for civil engineering as a whole and the various areas. The old series based on 2010=100 have all been rescaled to 2015=100.

## 4.142/43 Civil engineering

In addition to the series for the individual areas, a price index for the entire civil engineering sector is also published. This series is made up of the component series, with the weighting scheme being based on the most recent data from the 2016 National Accounts with a price adjustment to 2018.

 42.11a Road construction brick paving Shares2010=100 Shares2015=100 6.2 5.0 20.7 16.1 7.4 4.0 0.0 0.0 7.9 7.6 20.3 19.5 15.8 22.7 7.9 7.3 13.7 17.8 100.0 100.0 29.8 33.5 70.2 66.5

Table 1 above summarises this weighting scheme. Many of the shifts in weights are caused by a revision carried out by the NA. Because the weights always add up to 100, these adjustments also affect the other weights.

The series 4212a Railways; New construction and 4212b Railways; Exploitation/maintenance have a weight of 0 (zero) in the calculation of 42/43 Civil engineering as a whole. This is to prevent double counting, because they are already part of 4212 Railways and underground railways, which does make up part of the total.

In table 1 the share of labour, materials and equipment in the total figure for ‘42/43 Civil engineering’ has also been added for information. These shares are a weighted total of the breakdown between labour, materials and equipment for each area.

42/43 Civil engineering works
YearMonth2010=100 (rescaled) (index)2015=100 (index)
2012J100.5104.0
2012A101.4105.9
2012J101.6106.0
2012O102.3107.0
2013J102.2106.0
2013A101.6106.0
2013J101.8105.0
2013O101.6105.6
2014J102.1105.5
2014A101.7104.7
2014J101.9105.0
2014O101.9105.6
2015J99.5100.0
2015A100.4100.7
2015J100.8101.5
2015O99.498.5
2016J97.796.0
2016A98.196.9
2016J100.299.7
2016O101.0100.5
2017J102.8103.2
2017A102.6103.5
2017J101.5103.1
2017O102.5104.0
2018J104.8106.5
2018A104.3106.4
2018J106.7110.2
2018O108.8112.1
2019J107.5110.3
2019A108.7112.1
2019J109.2113.1
2019O109.3112.4

The above changes made in the base shift have the result that the new 2015=100 series shows a different course than the old series. Both at the beginning (in 2012) and at the end (in 2019), the 2015=100 line is slightly higher than that of 2010=100. On closer inspection this is found to have been caused in the period around the 2015 reference year. If we rescale both series to 2012=100, we can see that the difference in the development of the two series occurs mainly in the period 2015-2017. It is principally due to the series ‘Road construction; asphalt paving’ (see chart 4.2.2). With effect from this base shift a new price index for roadbuilding asphalt has been used for this series. See section 4.2.

## 4.2Areas

Below are the charts showing the course of the series based on 2010=100 and 2015=100 for the various areas.

YearMonth2010=100 (rescaled) (index)2015=100 (index)
2012J99.397.7
2012A100.098.4
2012J99.999.2
2012O100.799.9
2013J100.499.5
2013A100.399.5
2013J100.299.2
2013O100.099.1
2014J101.0100.3
2014A100.8100.0
2014J100.8100.0
2014O101.0100.4
2015J99.499.4
2015A99.999.6
2015J100.6100.5
2015O100.2100.3
2016J99.9100.0
2016A100.3100.6
2016J101.6101.8
2016O101.9101.8
2017J102.2101.5
2017A102.3102.3
2017J102.0102.3
2017O102.8103.1
2018J104.2104.1
2018A104.7104.8
2018J105.9105.7
2018O107.6107.2
2019J107.3107.2
2019A108.1108.0
2019J109.2109.3
2019O109.5109.6

The series 4211a, Road construction; brick paving based on 2010=100 and 2015=100 mainly show a similar development. The minor differences are due to the change in the weighting scheme as a result of the new, updated model used in the 2015=100 series.

YearMonth2010=100 (rescaled) (index)2015=100 (index)
2012J104.9132.6
2012A106.9140.0
2012J107.4133.7
2012O108.1138.2
2013J107.9133.3
2013A107.0132.9
2013J107.1130.1
2013O107.0133.8
2014J107.0130.7
2014A106.7127.8
2014J106.8127.7
2014O106.1126.4
2015J99.7100.8
2015A100.8103.7
2015J101.4106.4
2015O98.193.1
2016J94.184.0
2016A95.085.2
2016J98.995.4
2016O99.998.3
2017J102.8108.2
2017A102.1107.0
2017J100.1104.2
2017O101.6106.9
2018J105.0114.4
2018A102.3112.2
2018J108.0128.5
2018O110.7133.7
2019J107.1124.6
2019A109.4129.8
2019J110.1132.6
2019O109.4128.3

The two 4211b, Road construction; asphalt paving series show a very different development. This is mainly due to the use of a new series for price movements of roadbuilding asphalt.

PRODCOM 23991300, Bituminous mixtures based on natural and artificial stone materials and bitumen, natural asphalt or related substances as a binder was used in the 2010=100 series. At a certain time CBS received indications from users in ‘the field’ that the development of this index did not reflect their actual experience. Further investigations led to the conclusion that the group of materials in the PRODCOM concerned were not sufficiently homogeneous for use in the Road construction; asphalt paving series. This led to the creation of a new series with a more homogeneous composition that is now used in Road construction; asphalt paving.

4212 Railways and underground railways
YearMonth2010=100 (rescaled) (index)2015=100 (index)
2012J96.399.3
2012A96.899.8
2012J97.799.8
2012O97.799.9
2013J97.799.4
2013A97.798.9
2013J97.197.6
2013O96.897.5
2014J97.598.0
2014A97.097.7
2014J97.298.5
2014O98.099.2
2015J98.999.6
2015A100.3100.6
2015J100.7100.2
2015O100.299.7
2016J100.399.4
2016A100.099.5
2016J100.8101.4
2016O100.8101.3
2017J102.7103.8
2017A102.6104.9
2017J102.2103.7
2017O102.8104.8
2018J103.7105.8
2018A103.8105.8
2018J105.0107.2
2018O105.5107.5
2019J105.6107.7
2019A106.0108.5
2019J106.9108.9
2019O107.1109.2

The two 4212 Railways and underground railways series based on 2010=100 and 2015=100 show a similar trend over the long term. Minor differences have arisen due to the choice of new models and the associated new weighting schemes.

4213 Bridges and tunnels
YearMonth2010=100 (rescaled) (index)2015=100 (index)
2012J99.6100.2
2012A100.0100.6
2012J100.3100.6
2012O100.7100.9
2013J100.8100.8
2013A100.5100.3
2013J99.999.5
2013O100.399.9
2014J101.1100.7
2014A100.5100.1
2014J100.3100.0
2014O100.5100.5
2015J99.899.9
2015A100.0100.3
2015J100.4100.5
2015O99.799.7
2016J99.499.1
2016A100.199.6
2016J101.6101.1
2016O101.3100.9
2017J102.5102.4
2017A103.2103.5
2017J103.5103.2
2017O105.2105.0
2018J106.1106.0
2018A106.2106.3
2018J107.2107.3
2018O107.8108.1
2019J108.6108.6
2019A108.2108.7
2019J109.4109.4
2019O108.6108.8

The new model in the series 4213, Bridges and tunnels gives rise to no major differences between the series based on 2010=100 and 2015=100.

4221 Constructions for fluids
YearMonth2010=100 (rescaled) (index)2015=100 (index)
2012J98.095.4
2012A98.496.1
2012J98.796.3
2012O99.696.8
2013J99.596.6
2013A99.396.9
2013J99.797.1
2013O99.697.1
2014J100.197.7
2014A99.697.7
2014J99.898.4
2014O100.4101.3
2015J99.6100.3
2015A99.998.9
2015J100.5100.2
2015O100.0100.0
2016J99.399.3
2016A98.7100.5
2016J100.2101.0
2016O101.7101.6
2017J101.5103.5
2017A102.1103.1
2017J101.8105.0
2017O101.8104.5
2018J103.8107.2
2018A104.3108.3
2018J105.1108.3
2018O107.3110.0
2019J107.0110.4
2019A108.3112.2
2019J108.9112.1
2019O109.0112.5

The use of new models and the associated new weights of the different materials and labour gives rise to a difference between the series 4221 Constructions for fluids 2010=100 and 2015=100. The underlying cause is that concrete sewer pipes in the new model have been given a heavier weighting and their prices have risen by above-average amounts. The price movements in the new series are consequently greater than in the old series.

4291 Constructions for water projects
YearMonth2010=100 (rescaled) (index)2015=100 (index)
2012J103.4100.1
2012A104.7101.8
2012J104.1104.4
2012O105.4105.2
2013J105.2104.8
2013A104.4104.2
2013J105.2103.5
2013O104.8104.0
2014J105.6104.4
2014A105.2103.8
2014J105.3103.9
2014O104.7104.0
2015J99.499.6
2015A100.6100.3
2015J101.0101.4
2015O99.099.3
2016J95.196.5
2016A96.698.0
2016J100.0100.5
2016O100.5100.2
2017J103.2100.6
2017A102.5101.8
2017J101.1101.3
2017O102.7102.4
2018J105.4104.1
2018A105.2104.5
2018J108.1107.5
2018O111.1109.5
2019J108.3108.0
2019A109.3109.8
2019J110.0111.0
2019O110.1110.7

The series 4291, Constructions and construction works for water projects also shows only slight differences between the 2010=100 and 2015=100 series, which can be traced back to the new model and the weighting scheme.

4312 Site preparation works
YearMonth2010=100 (rescaled) (index)2015=100 (index)
2012J102.698.3
2012A103.299.3
2012J102.8102.9
2012O103.4103.4
2013J103.8104.2
2013A102.8103.0
2013J103.7103.5
2013O103.3103.3
2014J103.7103.5
2014A103.4103.2
2014J104.0103.2
2014O103.4103.0
2015J99.699.6
2015A100.4100.2
2015J100.7100.8
2015O99.399.7
2016J97.196.2
2016A98.298.4
2016J100.3100.1
2016O100.999.9
2017J103.0100.1
2017A101.4100.9
2017J99.7100.3
2017O100.4101.1
2018J105.2103.3
2018A103.6103.4
2018J106.5105.3
2018O110.3107.5
2019J109.6105.4
2019A110.8107.1
2019J109.3107.6
2019O111.6108.3

The new 2015=100 series for 4312, Site preparation works has price movements both at the beginning of 2012 and in mid-2018 that differ from those in the old 2010=100 series. This is due to the choice of the proxy used for movements in the price of filling sand.

4321 Electrical installation works
YearMonth2010=100 (rescaled) (index)2015=100 (index)
2012J96.999.3
2012A97.199.8
2012J97.7100.5
2012O97.599.9
2013J97.699.6
2013A97.1100.7
2013J96.699.3
2013O96.398.6
2014J96.798.9
2014A96.498.3
2014J96.598.8
2014O97.799.5
2015J98.8100.1
2015A100.8101.4
2015J100.5100.0
2015O99.999.0
2016J101.199.1
2016A100.598.5
2016J101.099.4
2016O101.2101.0
2017J104.6103.5
2017A104.4104.1
2017J103.5103.7
2017O104.0103.9
2018J104.6103.8
2018A105.4103.5
2018J106.6104.2
2018O107.3104.3
2019J107.6104.4
2019A108.1104.6
2019J108.7105.1
2019O108.8105.0

In area 4321, Electrical installation works the Road signage work type in the 2015=100 series represents an important (or more important) component. PRODCOM 26200000, Manufacture of computers and peripheral equipment was chosen as a proxy for the electrical components in this series. This shows smaller price movements than the previously used residual PRODCOM group 279x, Manufacture of other electrical equipment. This is the main reason for the movements in the new 2015=100 series.