The Watchtower (WT) is an amazing religion. It's fascinating to research and understand what they believe. Read articles on this website and you'll begin to understand why they have prospered.
According to 2012 Yearbook Of Jehovah's Witnesses here are the facts about the religion as of 2011 based on worldwide, global numbers.
98 branch offices of Jehovah's Witnesses
The preach in 236 countries
19,374,737 attended the annual Memorial Celebration
11,824 partook of the Memorial Celebration emblems (i.e. the symbolic bread and wine)
7,659,019 active 'peak' publishers that reported preaching activity
7,395,672 average publishers preaching every month
2.4 percent increase over 2010
263,131 were baptized into the faith
466,911 average 'auxiliary pioneer publishers' each month
895,844 average 'pioneer publishers' each month
1,707,094,710 total hours were reported in 2011 for preaching
8,490,746 average home Bible studies each month
20,595 ordained ministers staff branch facilities
$173,000,000 was spent caring for special pioneers, missionaries, and traveling overseers
236—Lands where Jehovah’s Witnesses preach
540—Languages in which we publish Bibles and Bible-based literature
7,395,672—Ministers who teach the Bible
19,000,000—People who attend our meetings or conventions
166,000,000—Bibles published by Jehovah’s Witnesses in 108 languages
20,000,000,000—Pieces of Bible-based literature published by Jehovah’s Witnesses over the past ten years
The 2012 Yearbook of Jehovah's Witnesses says that worldwide attendance at the 2011 Memorial Celebration was 19,374,737 - an increase of over half a million over the prior year. However only 11,824 participated in eating the bread and wine that represents Christ.