| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 19 | 128 |
| 2014 | 21 | 131 |
| 2013 | 16 | 141 |
| 2012 | 15 | 139 |
| 2011 | 13 | 142 |
| 2010 | 14 | 138 |
| 2009 | 12 | 137 |
| 2008 | 13 | 137 |
| 2007 | 10 | 141 |
| 2006 | 8 | 140 |
| 2005 | 6 | 137 |
| 2004 | 7 | 136 |
| 2003 | 5 | 136 |
| 2002 | 4 | 136 |
| 2001 | 4 | 135 |
| 2000 | 3 | 140 |
| 1999 | 3 | 136 |
| 1998 | 3 | 136 |
| 1997 | 2 | 145 |
| 1996 | 3 | 141 |
| 1995 | 5 | 127 |
| 1994 | 4 | 106 |
| 1993 | 7 | 95 |
| 1992 | 9 | 84 |
| 1991 | 9 | 89 |
| 1990 | 10 | 86 |