An August 2017 survey by the Bertelsmann Stiftung foundation found that among Austrian Muslims, 64% were Sunni and 4% were Shia.[35] Medien-Servicestelle Neue Österreicher estimated in 2010 that 10-20% of Austrian Muslims were Alevi.[2] Of the 300 Ahmadi Muslims in Austria, about one third reside in Vienna.[36]