| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2012 | 10770.3 | 10 |
| 2011 | 14192.3 | 10 |
| 2010 | 13609.1 | 10 |
| 2009 | 15992.6 | 5 |
| 2008 | 24402.4 | 7 |
| 2007 | 29621.2 | 7 |
| 2006 | 19306.2 | 6 |
| 2005 | 15572.5 | 5 |
| 2004 | 11946.6 | 6 |
| 2003 | 9351.7 | 6 |
| 2002 | 10139.8 | 5 |
| 2001 | 8386 | 7 |
| 2000 | 9858.6 | 7 |
| 1999 | 7443.2 | 7 |
| 1998 | 6990.3 | 5 |
| 1997 | 4530.2 | 7 |
| 1996 | 2509.5 | 10 |
| 1995 | 597.9 | 17 |
| 1994 | 614.5 | 20 |
| 1993 | 471.6 | 18 |
| 1992 | 399.9 | 14 |
| 1991 | 405.9 | 10 |
| 1990 | 409.7 | 9 |
| 1989 | 383.9 | 11 |
| 1988 | 256.1 | 10 |