A Pew Research Center study, published in January 2011, forecast an increase of Muslims in European population from 6% in 2010 to 8% in 2030. The study also predicted that Muslim fertility rate in Europe would drop from 2.2 in 2010 to 2.0 in 2030. On the other hand, the non-Muslim fertility rate in Europe would increase from 1.5 in 2010 to 1.6 in 2030. Another Pew study published in 2017 projected that in 2050 Muslims will make 7.4% (if all migration into Europe were to immediately and permanently stop - a "zero migration" scenario) up to 14% (under a "high" migration scenario) of Europe's population. Data from the 2000s for the rates of growth of Islam in Europe showed that the growing number of Muslims was due primarily to immigration and higher birth rates.