| 年份 | 单位：百万美元 |
| 2011 | 47500.00 |
| 2010 | 48880.00 |
| 2009 | 37667.40 |
| 2008 | 42586.50 |
| 2007 | 46230.90 |
| 2006 | 38549.30 |
| 2005 | 36177.80 |
| 2004 | 32138.10 |
| 2003 | 27274.80 |
| 2002 | 23560.20 |
| 2001 | 19704.40 |
| 2000 | 18780.60 |
| 1999 | 16783.60 |
| 1998 | 15727.00 |
| 1997 | 18539.90 |
| 1996 | 17667.40 |
| 1995 | 16342.50 |
| 1994 | 14163.80 |
| 1993 | 12977.60 |
| 1992 | 9800.50 |
| 1991 | 7200.30 |
| 1990 | 3629.20 |
| 1989 | 2745.00 |
| 1988 | 1763.50 |
| 1987 | 937.60 |
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