Upvote:2
From 2000-2008:
Over these nine years, the Catholic presence in the world has grown from 1.045 billion in 2000 to 1.166 billion in 2008, an increase of 11.54%. Considering the statistics in detail, numbers in Africa grew by 33%, in Europe they remained generally stable (an increase of 1.17%), while in Asia they increased by 15.61%, in Oceania by 11.39% and in America by 10.93%. As a percentage of the total population, European Catholics represented 26.8% in 2000 and 24.31% in 2008. In America and Oceania they have remained stable, and increased slightly in Asia.
Source: zenit.org (from the Statistical Yearbook of the Church)
Unfortunately this doesn't help identify the converts' previous religious beliefs, but possibly the Yearbook might have those sort of details.