| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 6224.8 | 16 |
| 2011 | 7401.8 | 16 |
| 2010 | 10568.1 | 12 |
| 2009 | 10888.9 | 11 |
| 2008 | 10497.5 | 13 |
| 2007 | 11075.5 | 14 |
| 2006 | 6384.8 | 16 |
| 2005 | 4339 | 16 |
| 2004 | 3790.8 | 16 |
| 2003 | 2848 | 14 |
| 2002 | 1971.2 | 16 |
| 2001 | 2493 | 14 |
| 2000 | 5098.1 | 13 |
| 1999 | 2788.3 | 13 |
| 1998 | 1482.4 | 15 |
| 1997 | 1583 | 17 |
| 1996 | 961.5 | 18 |
| 1995 | 219.6 | 25 |
| 1994 | 273.8 | 22 |
| 1993 | 217.8 | 23 |
| 1992 | 207 | 18 |
| 1991 | 231.5 | 16 |
| 1990 | 219.2 | 14 |
| 1989 | 173.6 | 14 |
| 1988 | 122.4 | 14 |