| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 40 | 124 |
| 2015 | 40 | 129 |
| 2014 | 53 | 128 |
| 2013 | 55 | 126 |
| 2012 | 52 | 128 |
| 2011 | 52 | 126 |
| 2010 | 39 | 128 |
| 2009 | 33 | 127 |
| 2008 | 49 | 117 |
| 2007 | 37 | 117 |
| 2006 | 27 | 124 |
| 2005 | 23 | 125 |
| 2004 | 18 | 129 |
| 2003 | 14 | 129 |
| 2002 | 10 | 134 |
| 2001 | 9 | 136 |
| 2000 | 8 | 139 |
| 1999 | 6 | 148 |
| 1998 | 10 | 126 |
| 1997 | 12 | 120 |
| 1996 | 11 | 124 |
| 1995 | 8 | 128 |
| 1994 | 7 | 131 |