| 年份 | 单位:十亿美元 |
| 2012 | 购买后可见 » |
| 2011 | 购买后可见 » |
| 2010 | 购买后可见 » |
| 2009 | 购买后可见 » |
| 2008 | 购买后可见 » |
| 2007 | 购买后可见 » |
| 2006 | 购买后可见 » |
| 2005 | 购买后可见 » |
| 2004 | 购买后可见 » |
| 2003 | 购买后可见 » |
| 2002 | 150774.60 |
| 2001 | 112209.50 |
| 2000 | 75520.80 |
| 1999 | 75709.20 |
| 1998 | 87069.70 |
| 1997 | 69034.10 |
| 1996 | 37521.70 |
| 1995 | 15758.00 |
| 1994 | 11009.60 |
| 1993 | 8257.00 |
| 1992 | 6645.10 |
| 1991 | 10291.80 |
| 1990 | 5534.40 |
| 1989 | 2699.30 |
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