Time Magazine Feb. 25, 2008
"An even more extreme example of what might be called "masked churn" is the relatively tiny Jehovah's Witnesses, with a turnover rate of about two-thirds. That means that two-thirds of the people who told Pew they were raised Jehovah's Witnesses no longer are — yet the group attracts roughly the same number of converts. Notes Lugo, "No wonder they have to keep on knocking on doors."