| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 41 | 116 |
| 2015 | 44 | 132 |
| 2014 | 46 | 136 |
| 2013 | 44 | 141 |
| 2012 | 42 | 141 |
| 2011 | 44 | 138 |
| 2010 | 43 | 132 |
| 2009 | 28 | 138 |
| 2008 | 29 | 141 |
| 2007 | 24 | 142 |
| 2006 | 21 | 139 |
| 2005 | 19 | 140 |
| 2004 | 15 | 142 |
| 2003 | 14 | 141 |
| 2002 | 13 | 136 |
| 2001 | 13 | 131 |
| 2000 | 13 | 129 |
| 1999 | 12 | 127 |
| 1998 | 10 | 134 |
| 1997 | 9 | 139 |
| 1996 | 8 | 141 |
| 1995 | 8 | 139 |
| 1994 | 5 | 140 |
| 1993 | 7 | 128 |
| 1992 | 6 | 129 |
| 1991 | 10 | 112 |