note: France maintains a tradition of secularism and has not officially collected data on religious affiliation since the 1872 national census, which complicates assessments of France's religious composition; an 1872 law prohibiting state authorities from collecting data on individuals' ethnicity or religious beliefs was reaffirmed by a 1978 law emphasizing the prohibition of the collection or exploitation of personal data revealing an individual's race, ethnicity, or political, philosophical, or religious opinions; a 1905 law codified France's separation of church and state