| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 2294.6 | 22 |
| 2011 | 2324.4 | 23 |
| 2010 | 2179.5 | 22 |
| 2009 | 1349.4 | 25 |
| 2008 | 1167.7 | 29 |
| 2007 | 1082.1 | 37 |
| 2006 | 1008 | 30 |
| 2005 | 892.9 | 30 |
| 2004 | 1091.1 | 23 |
| 2003 | 965.7 | 21 |
| 2002 | 476.1 | 25 |
| 2001 | 357 | 27 |
| 2000 | 232.6 | 31 |
| 1999 | 416 | 28 |
| 1998 | 216.2 | 30 |
| 1997 | 242.1 | 30 |
| 1996 | 443.7 | 19 |
| 1995 | 570 | 18 |
| 1994 | 801.9 | 19 |
| 1993 | 869.3 | 11 |
| 1992 | 720.6 | 10 |
| 1991 | 300.9 | 14 |
| 1990 | 228.9 | 13 |
| 1989 | 134.5 | 18 |
| 1988 | 56 | 18 |