The normally high standard of discussion on Debating Europe's "Should Esperanto be the Language of Europe?" has slipped a bit lately but this question was worth an answer anyway so here's an infographic of it.
References (cited in Wikipedia December 16th 2012)
1. Curtis, Andy. Color, Race, And English Language Teaching: Shades of Meaning. 2006, page 192.
2. "English Language". Columbia University Press. 2005. Retrieved 26 March 2007.
3. 20,000 ESL Teaching Jobs Oxford Seminars. Retrieved 17 April 2012
4. "U.S. Census Bureau – World POPClock Projection". July 2012–July 2013 data. The number on this page is automatically updated daily.