| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 33 | 143 |
| 2014 | 41 | 141 |
| 2013 | 58 | 134 |
| 2012 | 53 | 134 |
| 2011 | 44 | 139 |
| 2010 | 30 | 140 |
| 2009 | 27 | 139 |
| 2008 | 37 | 139 |
| 2007 | 26 | 138 |
| 2006 | 16 | 146 |
| 2005 | 12 | 152 |
| 2004 | 15 | 144 |
| 2003 | 11 | 144 |
| 2002 | 9 | 145 |
| 2001 | 8 | 141 |
| 2000 | 9 | 138 |
| 1999 | 7 | 142 |
| 1998 | 8 | 144 |
| 1997 | 9 | 140 |
| 1996 | 8 | 142 |
| 1995 | 9 | 137 |
| 1994 | 7 | 134 |
| 1993 | 7 | 129 |
| 1992 | 2 | 146 |
| 1991 | 8 | 121 |
| 1990 | 9 | 111 |