In the last 50 years from the year 1950 until the year 2000 Islam has increased by 235 percent!! While at the same time Christianity has grown 57% and Judaism only 5%. (World Almanac and Book of Facts 1992 pg 725, U.S. News and World Report Oct 8, 1990, Encyclopedia Britannica 1989 vol. 22) As you can see these facts are not from Muslim publications where one might expect to find such things. However, they are from other well respected sources as well.
Statistics from the U.N.: