| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 11266.1 | 9 |
| 2011 | 14742.4 | 9 |
| 2010 | 14670.7 | 7 |
| 2009 | 13658.1 | 8 |
| 2008 | 32654.9 | 5 |
| 2007 | 34188.9 | 5 |
| 2006 | 25047 | 4 |
| 2005 | 15260.6 | 6 |
| 2004 | 14158.5 | 4 |
| 2003 | 11036.6 | 5 |
| 2002 | 9347.7 | 6 |
| 2001 | 10773.4 | 5 |
| 2000 | 10832.7 | 4 |
| 1999 | 7875.7 | 6 |
| 1998 | 5912.5 | 7 |
| 1997 | 4025.5 | 8 |
| 1996 | 2771 | 7 |
| 1995 | 3645.5 | 5 |
| 1994 | 3076.9 | 5 |
| 1993 | 1742.8 | 6 |
| 1992 | 1218.4 | 5 |
| 1991 | 1135.7 | 5 |
| 1990 | 1168.9 | 5 |
| 1989 | 1072.9 | 6 |
| 1988 | 655.1 | 6 |