| 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 | 452.48 |
| 2001 | 388.72 |
| 2000 | 352.93 |
| 1999 | 337.99 |
| 1998 | 146.65 |
| 1997 | 105.70 |
| 1996 | 60.56 |
| 1995 | 34.34 |
| 1994 | 25.11 |
| 1993 | 19.20 |
| 1992 | 17.02 |
| 1991 | 15.76 |
| 1990 | 7.28 |
| 1989 | 2.21 |
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