| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 6410 | 15 |
| 2011 | 9281.2 | 14 |
| 2010 | 8694.4 | 14 |
| 2009 | 7955.6 | 12 |
| 2008 | 15052.7 | 10 |
| 2007 | 17778 | 11 |
| 2006 | 12867.6 | 12 |
| 2005 | 8832.7 | 10 |
| 2004 | 7271.4 | 10 |
| 2003 | 5755.7 | 9 |
| 2002 | 6567.3 | 8 |
| 2001 | 3008.7 | 13 |
| 2000 | 6091.4 | 12 |
| 1999 | 5389.6 | 8 |
| 1998 | 6373.4 | 6 |
| 1997 | 4949.1 | 5 |
| 1996 | 3927.8 | 5 |
| 1995 | 3109.3 | 6 |
| 1994 | 2267.2 | 7 |
| 1993 | 1678.8 | 7 |
| 1992 | 754.1 | 9 |
| 1991 | 688.4 | 8 |