While according to Pew Research Center survey it is expected that from 2010 to 2050 significant number of Christians will leave their faith.[164] Most of the switching are expected into the unaffiliated and Irreligion.[165] The Pew Research study also found that Christianity has the highest number of defectors between 2010 to 2050 compared to any other religions.[166] On the other hand, conversion into Christianity have also been well documented.[167][168] Large increases in the developing world (around 23,000 per day) have been accompanied by substantial declines in the developed world, mainly in Europe and North America.[169] According to the World Christian Encyclopedia, approximately 2.7 million converting to Christianity annually from another religion, World Christian Encyclopedia also cited that Christianity rank at first place in net gains through religious conversion.[170] On the other hand, demographer Conrad Hackett of Pew Research Center stated that the World Christian Encyclopedia gives a higher estimate for percent Christian when compared to other cross-national data sets".[171]