| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 32 | 95 |
| 2015 | 31 | 113 |
| 2014 | 30 | 116 |
| 2013 | 28 | 120 |
| 2012 | 26 | 123 |
| 2011 | 23 | 130 |
| 2010 | 19 | 129 |
| 2009 | 17 | 124 |
| 2008 | 19 | 126 |
| 2007 | 15 | 129 |
| 2006 | 14 | 127 |
| 2005 | 13 | 126 |
| 2004 | 12 | 124 |
| 2003 | 11 | 120 |
| 2002 | 11 | 110 |
| 2001 | 11 | 108 |
| 2000 | 10 | 112 |
| 1999 | 10 | 115 |
| 1998 | 9 | 118 |
| 1997 | 9 | 118 |
| 1996 | 9 | 111 |
| 1995 | 8 | 113 |
| 1994 | 8 | 98 |