| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 916.8 | 30 |
| 2011 | 1396.2 | 27 |
| 2010 | 1295.5 | 27 |
| 2009 | 1153.1 | 27 |
| 2008 | 1106.8 | 30 |
| 2007 | 1128.5 | 36 |
| 2006 | 488.3 | 39 |
| 2005 | 419 | 37 |
| 2004 | 275.6 | 36 |
| 2003 | 147.7 | 36 |
| 2002 | 130.4 | 36 |
| 2001 | 96.7 | 36 |
| 2000 | 143.1 | 36 |
| 1999 | 199 | 32 |
| 1998 | 106.1 | 36 |
| 1997 | 429.3 | 25 |
| 1996 | 321.4 | 25 |
| 1995 | 144 | 30 |
| 1994 | 118 | 30 |
| 1993 | 91.6 | 28 |
| 1992 | 39 | 31 |
| 1991 | 29.2 | 31 |
| 1990 | 39.9 | 27 |
| 1989 | 5.4 | 36 |
| 1988 | 0 | 49 |