| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 419.5 | 11 |
| 2015 | 366 | 14 |
| 2014 | 459.8 | 10 |
| 2013 | 540 | 11 |
| 2012 | 575.5 | 8 |
| 2011 | 655.5 | 8 |
| 2010 | 352.1 | 15 |
| 2009 | 286.8 | 13 |
| 2008 | 451.6 | 13 |
| 2007 | 444.4 | 20 |
| 2006 | 305.5 | 16 |
| 2005 | -250.9 | 194 |
| 2004 | 429.1 | 6 |
| 2003 | 89.9 | 17 |
| 2002 | 146.6 | 15 |
| 2001 | 107.2 | 15 |
| 2000 | 148.9 | 17 |
| 1999 | 33.1 | 30 |
| 1998 | 59.6 | 21 |
| 1997 | 76.3 | 14 |
| 1996 | 61.8 | 14 |
| 1995 | 120.3 | 7 |
| 1994 | 50 | 13 |
| 1993 | 43.2 | 11 |
| 1992 | 57 | 7 |
| 1991 | 43.1 | 11 |
| 1990 | 81.1 | 6 |
| 1989 | 72.6 | 6 |
| 1988 | 73.8 | 4 |
| 1987 | 52.6 | 4 |
| 1986 | 53.4 | 3 |