Since 1980, it has been illegal for the government to collect statistics on religious beliefs or practices. An estimation by the CIA Factbook for the year 2000 is that 87% of Luxembourgers are Catholic, including the grand ducal family, the remaining 13% being made up of Protestants, Orthodox Christians, Jews, Muslims, and those of other or no religion. According to a 2010 Pew Research Center study, 70.4% are Christian, 2.3% Muslim, 26.8% unaffiliated, and 0.5% other religions.