| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 38 | 92 |
| 2015 | 36 | 107 |
| 2014 | 41 | 107 |
| 2013 | 40 | 109 |
| 2012 | 37 | 111 |
| 2011 | 41 | 107 |
| 2010 | 38 | 107 |
| 2009 | 40 | 105 |
| 2008 | 44 | 106 |
| 2007 | 34 | 109 |
| 2006 | 27 | 108 |
| 2005 | 24 | 106 |
| 2004 | 21 | 106 |
| 2003 | 16 | 105 |
| 2002 | 12 | 108 |
| 2001 | 11 | 109 |
| 2000 | 11 | 110 |
| 1999 | 11 | 104 |
| 1998 | 11 | 104 |
| 1997 | 9 | 114 |
| 1996 | 7 | 116 |
| 1995 | 5 | 122 |
| 1994 | 3 | 115 |