| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 329.8 | 13 |
| 2015 | 68.5 | 39 |
| 2014 | 220.3 | 17 |
| 2013 | 692.2 | 5 |
| 2012 | 505.9 | 10 |
| 2011 | 550.8 | 9 |
| 2010 | 431.7 | 10 |
| 2009 | 365.8 | 9 |
| 2008 | 747.8 | 8 |
| 2007 | 558.7 | 14 |
| 2006 | 375.9 | 12 |
| 2005 | 155.1 | 18 |
| 2004 | 154 | 15 |
| 2003 | 79.3 | 19 |
| 2002 | 34.7 | 30 |
| 2001 | 28.5 | 35 |
| 2000 | 26.8 | 36 |
| 1999 | 33.1 | 31 |
| 1998 | 27.6 | 34 |
| 1997 | 48.6 | 21 |
| 1996 | 25.8 | 27 |
| 1995 | 20.7 | 29 |
| 1994 | 6.9 | 42 |
| 1993 | 12.1 | 28 |
| 1992 | 11.6 | 23 |