Calculation method

Until recently, Statistics Netherlands calculated the number of Muslims in the Netherlands by determining the number of Muslims in each group of persons with the same ethnic background. The total number of Muslims in the Netherlands was calculated by adding up the numbers of Muslims in each group.
The calculation of the number of Muslims among Turks, Moroccans and Surinamese was based on the survey Sociale positie en voorzieningengebruik van allochtonen published by the Social and Cultural Planning Office. The amounts of Muslims in the other groups were calculated on the basis of the Muslim population in their countries of origin. It is assumed that in all second-generation groups aged 18 years and older 15 percent no longer identifies with any kind of religious denomination.