| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 9 | 106 |
| 2015 | 9 | 118 |
| 2014 | 11 | 118 |
| 2013 | 11 | 117 |
| 2012 | 11 | 115 |
| 2011 | 10 | 117 |
| 2010 | 8 | 122 |
| 2009 | 9 | 117 |
| 2008 | 12 | 111 |
| 2007 | 10 | 114 |
| 2006 | 8 | 114 |
| 2005 | 7 | 117 |
| 2004 | 7 | 118 |
| 2003 | 6 | 112 |
| 2002 | 6 | 116 |
| 2001 | 5 | 114 |
| 2000 | 5 | 115 |
| 1999 | 4 | 118 |
| 1998 | 6 | 112 |
| 1997 | 7 | 103 |
| 1996 | 8 | 95 |
| 1995 | 7 | 102 |
| 1994 | 6 | 87 |
| 1993 | 8 | 83 |
| 1992 | 9 | 73 |
| 1991 | 9 | 78 |
| 1990 | 9 | 73 |