| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 310.7 | 15 |
| 2015 | 253 | 17 |
| 2014 | 357.8 | 11 |
| 2013 | 522.9 | 12 |
| 2012 | 249.2 | 19 |
| 2011 | 317.8 | 15 |
| 2010 | 410.2 | 11 |
| 2009 | 134.8 | 26 |
| 2008 | 795.6 | 6 |
| 2007 | 737.7 | 8 |
| 2006 | 329.9 | 14 |
| 2005 | 267.2 | 12 |
| 2004 | 251.8 | 8 |
| 2003 | 307.4 | 7 |
| 2002 | 394.1 | 6 |
| 2001 | 288.9 | 9 |
| 2000 | 404.9 | 9 |
| 1999 | 185.2 | 12 |
| 1998 | 142.8 | 11 |
| 1997 | 89.4 | 13 |
| 1996 | 96.2 | 9 |
| 1995 | 80.9 | 12 |
| 1994 | 92.2 | 6 |
| 1993 | 96.8 | 5 |
| 1992 | 132.8 | 4 |
| 1991 | 124.9 | 4 |
| 1990 | 139.8 | 3 |
| 1989 | 84.3 | 5 |
| 1988 | 70.2 | 5 |
| 1987 | 45.7 | 6 |
| 1986 | 34.5 | 4 |