| 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 | 47.86 |
| 2001 | 51.68 |
| 2000 | 52.37 |
| 1999 | 47.94 |
| 1998 | 37.39 |
| 1997 | 28.57 |
| 1996 | 22.13 |
| 1995 | 16.15 |
| 1994 | 10.82 |
| 1993 | 8.04 |
| 1992 | 6.73 |
| 1991 | 4.83 |
| 1990 | 4.28 |
| 1989 | 3.36 |
| 1988 | 2.45 |
| 1987 | 0.18 |
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