| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 1181.6 | 27 |
| 2011 | 1119.8 | 29 |
| 2010 | 1085.3 | 29 |
| 2009 | 770.6 | 30 |
| 2008 | 1082 | 32 |
| 2007 | 1156.2 | 34 |
| 2006 | 801 | 32 |
| 2005 | 527.4 | 34 |
| 2004 | 428.4 | 34 |
| 2003 | 234.9 | 34 |
| 2002 | 277.3 | 30 |
| 2001 | 400.4 | 25 |
| 2000 | 453.4 | 27 |
| 1999 | 360.4 | 30 |
| 1998 | 341.6 | 28 |
| 1997 | 523.9 | 21 |
| 1996 | 430.4 | 20 |
| 1995 | 343.8 | 21 |
| 1994 | 829.6 | 17 |
| 1993 | 624.5 | 16 |
| 1992 | 445.8 | 13 |
| 1991 | 317.2 | 13 |
| 1990 | 122.1 | 19 |
| 1989 | 62.3 | 25 |
| 1988 | 57.3 | 17 |