| 年份 | 單位：億美元 |
| 2006 | 1937.27 |
| 2005 | 1890.65 |
| 2004 | 1534.79 |
| 2003 | 1150.69 |
| 2002 | 827.68 |
| 2001 | 691.95 |
| 2000 | 623.80 |
| 1999 | 412.23 |
| 1998 | 521.02 |
| 1997 | 510.03 |
| 1996 | 732.76 |
| 1995 | 912.82 |
| 1994 | 826.80 |
| 1993 | 1114.36 |
| 1992 | 581.24 |
| 1991 | 119.77 |
| 1990 | 65.96 |
| 1989 | 56.00 |
| 1988 | 52.97 |
| 1987 | 37.09 |
| 1986 | 33.30 |
| 1985 | 63.33 |
| 1984 | 26.51 |
| 1983 | 17.32 |
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