| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 12294.2 | 6 |
| 2011 | 15516.4 | 7 |
| 2010 | 15975.4 | 6 |
| 2009 | 14896.4 | 7 |
| 2008 | 16261.4 | 9 |
| 2007 | 9168.8 | 16 |
| 2006 | 4038.7 | 18 |
| 2005 | 2941 | 17 |
| 2004 | 2815.6 | 17 |
| 2003 | 2436.3 | 16 |
| 2002 | 2106.6 | 15 |
| 2001 | 1963.6 | 16 |
| 2000 | 3778.7 | 15 |
| 1999 | 2474.3 | 14 |
| 1998 | 2059.2 | 12 |
| 1997 | 4893.7 | 6 |
| 1996 | 1664.2 | 13 |
| 1995 | 1068.9 | 10 |
| 1994 | 1471.6 | 10 |
| 1993 | 1315.5 | 10 |
| 1992 | 786 | 8 |
| 1991 | 386.1 | 12 |
| 1990 | 346.3 | 12 |
| 1989 | 345.8 | 12 |
| 1988 | 234.1 | 11 |