| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 236.7 | 13 |
| 2015 | 246.1 | 13 |
| 2014 | 326.7 | 11 |
| 2013 | 328.7 | 12 |
| 2012 | 339.9 | 10 |
| 2011 | 369.4 | 11 |
| 2010 | 340 | 11 |
| 2009 | 256.5 | 11 |
| 2008 | 244.5 | 12 |
| 2007 | 204.9 | 12 |
| 2006 | 164.1 | 13 |
| 2005 | 135.9 | 13 |
| 2004 | 97.8 | 17 |
| 2003 | 83.9 | 17 |
| 2002 | 96.3 | 14 |
| 2001 | 109.2 | 12 |
| 2000 | 113.4 | 11 |
| 1999 | 98.6 | 13 |
| 1998 | 143.6 | 9 |
| 1997 | 139.3 | 11 |
| 1996 | 140.7 | 10 |
| 1995 | 143.2 | 9 |
| 1994 | 110.1 | 10 |
| 1993 | 84.4 | 14 |
| 1992 | 61 | 20 |
| 1991 | 117.8 | 9 |
| 1990 | 109.2 | 10 |
| 1989 | 107.5 | 9 |
| 1988 | 70 | 14 |
| 1987 | 51.5 | 15 |
| 1986 | 32.8 | 17 |