| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 41 | 109 |
| 2015 | 39 | 130 |
| 2014 | 45 | 130 |
| 2013 | 45 | 132 |
| 2012 | 43 | 132 |
| 2011 | 40 | 130 |
| 2010 | 34 | 133 |
| 2009 | 34 | 132 |
| 2008 | 36 | 128 |
| 2007 | 26 | 134 |
| 2006 | 19 | 135 |
| 2005 | 16 | 137 |
| 2004 | 14 | 137 |
| 2003 | 9 | 141 |
| 2002 | 8 | 139 |
| 2001 | 6 | 143 |
| 2000 | 6 | 145 |
| 1999 | 6 | 139 |
| 1998 | 6 | 139 |
| 1997 | 7 | 136 |
| 1996 | 6 | 134 |
| 1995 | 5 | 134 |