| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 10516.5 | 11 |
| 2011 | 12464.1 | 11 |
| 2010 | 12219 | 11 |
| 2009 | 7618.2 | 13 |
| 2008 | 10177.1 | 14 |
| 2007 | 13228.2 | 13 |
| 2006 | 8262.9 | 14 |
| 2005 | 6161.2 | 13 |
| 2004 | 5142.5 | 13 |
| 2003 | 3698.5 | 13 |
| 2002 | 2946.6 | 13 |
| 2001 | 2406.7 | 15 |
| 2000 | 2263.3 | 16 |
| 1999 | 1943.4 | 16 |
| 1998 | 1610.8 | 14 |
| 1997 | 1715.3 | 16 |
| 1996 | 1454 | 14 |
| 1995 | 986.5 | 11 |
| 1994 | 947.3 | 15 |
| 1993 | 677.1 | 13 |
| 1992 | 457.7 | 11 |
| 1991 | 468.3 | 9 |
| 1990 | 401.1 | 11 |
| 1989 | 447.9 | 9 |
| 1988 | 374.1 | 7 |