| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 36053.9 | 3 |
| 2011 | 41605.4 | 3 |
| 2010 | 42804.2 | 3 |
| 2009 | 41926.2 | 3 |
| 2008 | 58794.4 | 3 |
| 2007 | 64971.9 | 4 |
| 2006 | 62524.7 | 2 |
| 2005 | 49974.1 | 2 |
| 2004 | 34304.2 | 3 |
| 2003 | 22729.9 | 2 |
| 2002 | 15732.8 | 3 |
| 2001 | 18262.3 | 3 |
| 2000 | 26938.6 | 2 |
| 1999 | 18492.3 | 2 |
| 1998 | 9485.2 | 3 |
| 1997 | 12517.5 | 2 |
| 1996 | 12520 | 2 |
| 1995 | 12315.5 | 2 |
| 1994 | 11214.4 | 2 |
| 1993 | 9543.4 | 2 |
| 1992 | 6352.6 | 2 |
| 1991 | 9959.4 | 2 |
| 1990 | 16023.9 | 2 |
| 1989 | 28007 | 1 |
| 1988 | 25976.4 | 1 |