| 时间 |
值 （亿美元） |
世界排名 |
| 2012 |
2.9 |
71 |
| 2011 |
4.8 |
69 |
| 2010 |
6.3 |
66 |
| 2009 |
9.5 |
63 |
| 2008 |
22.7 |
63 |
| 2007 |
53.4 |
60 |
| 2006 |
43 |
53 |
| 2005 |
4.1 |
74 |
| 2004 |
1.8 |
78 |
| 2003 |
3.1 |
64 |
| 2002 |
6.2 |
55 |
| 2001 |
34.4 |
44 |
| 2000 |
92.6 |
41 |
| 1999 |
66.5 |
43 |
| 1998 |
6.2 |
58 |
| 1997 |
2.9 |
62 |
| 1996 |
4.6 |
54 |
| 1995 |
3 |
56 |
| 1994 |
0.9 |
61 |
| 1993 |
0.3 |
58 |
| 1992 |
0.9 |
50 |
| 1991 |
0.7 |
51 |