| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 423.1 | 10 |
| 2015 | 349.7 | 15 |
| 2014 | -10.5 | 194 |
| 2013 | 315.9 | 15 |
| 2012 | 329.5 | 16 |
| 2011 | 441.9 | 11 |
| 2010 | 389 | 13 |
| 2009 | 183.8 | 18 |
| 2008 | 680 | 10 |
| 2007 | 837.8 | 7 |
| 2006 | 789.5 | 6 |
| 2005 | 851.8 | 5 |
| 2004 | 355.8 | 7 |
| 2003 | 423.2 | 4 |
| 2002 | 514.9 | 4 |
| 2001 | 501.3 | 5 |
| 2000 | 413.8 | 8 |
| 1999 | 459.9 | 5 |
| 1998 | 295.2 | 6 |
| 1997 | 230.5 | 4 |
| 1996 | 219.7 | 4 |
| 1995 | 237.4 | 3 |
| 1994 | 158 | 3 |
| 1993 | 207.5 | 3 |
| 1992 | 218.4 | 1 |
| 1991 | 151.5 | 3 |
| 1990 | 131.8 | 4 |
| 1989 | 103 | 3 |
| 1988 | 84.9 | 3 |
| 1987 | 51.4 | 5 |
| 1986 | 32.6 | 5 |