| 序号 | 时间 (年) |
数据 (亿美元) |
|---|---|---|
| 1 | 2011 | |
| 2 | 2010 | |
| 3 | 2009 | |
| 4 | 2008 | |
| 5 | 2007 | |
| 6 | 2006 | |
| 7 | 2005 | |
| 8 | 2004 | |
| 9 | 2003 | |
| 10 | 2002 | |
| 11 | 2001 | -1.14 |
| 12 | 2000 | -1.87 |
| 13 | 1999 | -2.18 |
| 14 | 1998 | -2.46 |
| 15 | 1997 | -1.71 |
| 16 | 1996 | -2.12 |
| 17 | 1995 | -2.21 |
| 18 | 1994 | -1.59 |
| 19 | 1993 | -1.14 |
| 20 | 1992 | -1.23 |
