| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 58265.1 | 2 |
| 2011 | 76713.6 | 2 |
| 2010 | 80299.7 | 2 |
| 2009 | 89561.9 | 2 |
| 2008 | 54705.3 | 4 |
| 2007 | 77917 | 3 |
| 2006 | 16351.2 | 7 |
| 2005 | 5863 | 14 |
| 2004 | 7482.7 | 8 |
| 2003 | 4768.1 | 11 |
| 2002 | 3333.7 | 12 |
| 2001 | 4489.3 | 11 |
| 2000 | 7215.4 | 9 |
| 1999 | 3771 | 11 |
| 1998 | 2847.7 | 11 |
| 1997 | 3695.7 | 9 |
| 1996 | 2560.1 | 9 |
| 1995 | 497.7 | 20 |
| 1994 | 975.3 | 14 |
| 1993 | 433.9 | 20 |
| 1992 | 167.1 | 20 |
| 1991 | 8.2 | 39 |