| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 12255.3 | 7 |
| 2011 | 17581.9 | 6 |
| 2010 | 14050.4 | 8 |
| 2009 | 12888.7 | 9 |
| 2008 | 31052.9 | 6 |
| 2007 | 33630.9 | 6 |
| 2006 | 24866.7 | 5 |
| 2005 | 17631.5 | 4 |
| 2004 | 14060.6 | 5 |
| 2003 | 11472.1 | 4 |
| 2002 | 12330.6 | 4 |
| 2001 | 14195.8 | 4 |
| 2000 | 10691.2 | 5 |
| 1999 | 8147.4 | 5 |
| 1998 | 7618.9 | 4 |
| 1997 | 5357.5 | 4 |
| 1996 | 7687.5 | 3 |
| 1995 | 5735.5 | 3 |
| 1994 | 4606.2 | 4 |
| 1993 | 3029.8 | 4 |
| 1992 | 4460.2 | 3 |
| 1991 | 3793.8 | 3 |
| 1990 | 5018 | 3 |
| 1989 | 6286.3 | 3 |
| 1988 | 3502.7 | 4 |