| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2014 | 49 | 112 |
| 2013 | 43 | 115 |
| 2012 | 40 | 118 |
| 2011 | 45 | 117 |
| 2010 | 34 | 117 |
| 2009 | 27 | 117 |
| 2008 | 40 | 114 |
| 2007 | 34 | 115 |
| 2006 | 24 | 118 |
| 2005 | 20 | 117 |
| 2004 | 17 | 119 |
| 2003 | 14 | 115 |
| 2002 | 11 | 114 |
| 2001 | 12 | 114 |
| 2000 | 13 | 109 |
| 1999 | 12 | 106 |
| 1998 | 13 | 104 |
| 1997 | 12 | 107 |
| 1996 | 11 | 107 |
| 1995 | 12 | 106 |
| 1994 | 11 | 103 |
| 1993 | 11 | 93 |
| 1992 | 12 | 91 |