| 序号 | 时间 (年) |
数据 (亿美元) |
|---|---|---|
| 1 | 2012 | |
| 2 | 2011 | |
| 3 | 2010 | |
| 4 | 2009 | |
| 5 | 2008 | |
| 6 | 2007 | |
| 7 | 2006 | 57.58 |
| 8 | 2005 | 31.41 |
| 9 | 2004 | 16.38 |
| 10 | 2003 | 17.43 |
| 11 | 2002 | 18.46 |
| 12 | 2001 | 11.66 |
| 13 | 2000 | 13.07 |
| 14 | 1999 | 2.15 |
| 15 | 1998 | 1.17 |
| 16 | 1997 | 1.99 |
| 17 | 1993 | 17.96 |
| 18 | 1991 | 10.87 |
| 19 | 1990 | 8.51 |
| 20 | 1989 | 7.52 |
| 21 | 1988 | 8.92 |
| 22 | 1987 | 6.53 |
