| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 524.7 | 9 |
| 2015 | 525.8 | 11 |
| 2014 | 167.2 | 23 |
| 2013 | 674.1 | 7 |
| 2012 | 654.6 | 7 |
| 2011 | 974.8 | 6 |
| 2010 | 860.5 | 6 |
| 2009 | 566.7 | 5 |
| 2008 | 309.3 | 17 |
| 2007 | 508.5 | 15 |
| 2006 | 874.4 | 5 |
| 2005 | 598.6 | 7 |
| 2004 | -204.4 | 194 |
| 2003 | 653.5 | 2 |
| 2002 | 512.2 | 5 |
| 2001 | 569.3 | 2 |
| 2000 | 2479.9 | 2 |
| 1999 | 559.1 | 4 |
| 1998 | 236.4 | 7 |
| 1997 | 128 | 8 |
| 1996 | 64.3 | 12 |
| 1995 | 119.9 | 8 |
| 1994 | 72.9 | 9 |
| 1993 | 4 | 49 |
| 1992 | -21.2 | 170 |
| 1991 | 47.5 | 8 |
| 1990 | 30 | 12 |
| 1989 | 70.1 | 7 |
| 1988 | 10.6 | 18 |
| 1987 | 21.2 | 12 |
| 1986 | 22.4 | 8 |