Do you know which countries are homes to most people of the Muslim population of the world? If you think that this is the Middle East - you are not right. Actually, largest Muslim country is Indonesia - about 205 millions of people who affiliated with Islam lives there. The next are Pakistan and India and on 4th place is Bangladesh. The overall Muslim population of the world increased from 1990 to 2010 by more than 600 million. And by 2030, according to the estimates of Pew Research Center, there will be about 2,2 billions of people, who affiliated with Islam and they will be about 26% of total world population.
It is interesting that if to speak about not absolute increases, but about changes in shares of Muslims in the population of one or another country (the so called islamization process), most of such changes going to happen up in Europe (especially on the north) and Canada (look at the third map to observe the past and future changes).
Source: Global Muslim population & projections from the Pew Research Center "The Future of the Global Muslim Population" report.