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The Continuous Holiday Survey (CVO) is an annual survey conducted by CBS to compile figures on holiday practices of the Dutch population. The CVO is a panel survey in which - every three months - its members answer questions about their holidays spent in the preceding quarter. The annual figures published on the basis of the CVO are based on participants who have responded to all four measurements in the related holiday year. As of 2017, this includes around 8,000 persons.