Here's a historical view of the worldwide increase percentage proportion.
Sorry for the width - I tried to include as many years as the forum width would allow.
Seems like these countries are the reliable earners for the WTBTS, though the USA fluctuates quite a bit. Didn't realise Mexico once counted for 21% of the growth, in 2004.
Country or Territory | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 |
Mexico | 13 | 16 | 11 | 13 | 11 | 9 | 9 | 9 | 3 | 21 | 6 | 14 | 10 | 16 | 12 | 16 | 16 | 17 | 17 |
United States of America |
9 | 4 | 4 | 8 | 0 | 3 | 1 | 16 | 12 | 4 | 3 | 13 | 16 | 12 | 17 | 11 | 13 | 7 | 7 |
Congo, Dem. Republic of |
3 | 2 | 0 | 3 | 1 | 7 | 3 | 4 | 2 | 5 | 6 | 5 | 1 | 4 | 2 | 4 | 6 | 1 | 7 |
Brazil | 9 | 11 | 13 | 14 | 19 | 18 | 17 | 16 | 18 | 16 | 15 | 15 | 13 | 13 | 10 | 10 | 8 | 12 | 7 |
Nigeria | 4 | 3 | 3 | 5 | 8 | 7 | 11 | 5 | 5 | 4 | 5 | 4 | 5 | 6 | 4 | 4 | 3 | 6 | 5 |
Angola | 1 | 1 | 2 | 2 | 3 | 2 | 3 | 1 | 2 | 2 | 4 | 4 | 2 | 3 | 2 | 2 | 3 | 5 | 5 |
Philippines | 1 | 1 | 2 | 2 | 2 | 5 | 2 | 2 | 2 | 1 | 2 | 3 | 3 | 2 | 3 | 4 | 3 | 4 | 4 |
Colombia | 2 | 3 | 4 | 3 | 8 | 4 | 4 | 4 | 5 | 2 | 3 | 2 | 3 | 3 | 2 | 3 | 3 | 2 | 3 |
Venezuela | 2 | 2 | 2 | 1 | 2 | 2 | 3 | 2 | 3 | 2 | 1 | 1 | 2 | 2 | 3 | 3 | 3 | 3 | 3 |
Ghana | 1 | 1 | 2 | 2 | 3 | 3 | 3 | 2 | 1 | 2 | 2 | 3 | 2 | 3 | 3 | 4 | 3 | 3 | 3 |
Peru | 1 | 1 | 2 | 2 | 4 | 4 | 4 | 2 | 3 | 3 | 5 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
Zambia | 0 | 2 | 2 | 2 | 4 | 5 | 4 | 2 | 3 | 3 | 2 | 4 | 2 | 2 | 4 | 4 | 3 | 3 | 2 |
Ecuador | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 1 | 2 | 2 | 3 | 2 | 2 | 3 | 2 | 2 | 2 | 2 | 2 |
Guatemala | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 |
Malawi | 1 | 1 | 2 | 1 | 1 | 2 | 3 | 2 | 3 | 3 | 6 | 1 | 1 | 2 | 1 | 1 | 2 | 2 | 1 |