| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2011 | 346.99 | 89 |
| 2010 | 747.73 | 65 |
| 2009 | 630.28 | 65 |
| 2008 | 871.4 | 64 |
| 2007 | 675.16 | 64 |
| 2006 | 549.62 | 64 |
| 2005 | 473.34 | 63 |
| 2004 | 331.22 | 68 |
| 2003 | 262.66 | 68 |
| 2002 | 204.82 | 71 |
| 2001 | 341.1 | 60 |
| 2000 | 382.7 | 56 |
| 1999 | 359.77 | 56 |
| 1998 | 272.5 | 60 |
| 1997 | 306.99 | 58 |
| 1996 | 278.85 | 59 |
| 1995 | 255.44 | 61 |
| 1994 | 286.08 | 57 |
| 1993 | 306.57 | 56 |
| 1992 | 338.81 | 53 |
| 1991 | 319.95 | 53 |
| 1990 | 289.02 | 57 |