| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 3117.8 | 21 |
| 2011 | 3721.8 | 20 |
| 2010 | 3400.3 | 20 |
| 2009 | 3425 | 19 |
| 2008 | 4014.9 | 20 |
| 2007 | 4257.5 | 22 |
| 2006 | 3124.4 | 21 |
| 2005 | 2007.2 | 20 |
| 2004 | 1628.3 | 19 |
| 2003 | 1028.1 | 19 |
| 2002 | 788.3 | 18 |
| 2001 | 696.8 | 20 |
| 2000 | 774.9 | 23 |
| 1999 | 729.2 | 22 |
| 1998 | 583.5 | 21 |
| 1997 | 447.2 | 24 |
| 1996 | 272 | 26 |
| 1995 | 170.5 | 27 |
| 1994 | 156.1 | 26 |
| 1993 | 130.5 | 25 |
| 1992 | 77.7 | 28 |
| 1991 | 80.5 | 25 |
| 1990 | 81.6 | 22 |
| 1989 | 71 | 23 |
| 1988 | 49.5 | 20 |