| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 15138.4 | 5 |
| 2011 | 20328.6 | 5 |
| 2010 | 16266 | 5 |
| 2009 | 15814.9 | 6 |
| 2008 | 14660 | 11 |
| 2007 | 19740.2 | 9 |
| 2006 | 13401.2 | 10 |
| 2005 | 12029.8 | 7 |
| 2004 | 6388.9 | 12 |
| 2003 | 6827.1 | 7 |
| 2002 | 7921.6 | 7 |
| 2001 | 7039.6 | 8 |
| 2000 | 10680 | 6 |
| 1999 | 8258.3 | 4 |
| 1998 | 1455.7 | 17 |
| 1997 | 1720.2 | 15 |
| 1996 | 1772.7 | 11 |
| 1995 | 1852 | 8 |
| 1994 | 2860.6 | 6 |
| 1993 | 2117.1 | 5 |
| 1992 | 1161 | 6 |
| 1991 | 854.6 | 6 |
| 1990 | 759.5 | 6 |
| 1989 | 1212.6 | 5 |