| 时间 |
值 （亿美元） |
世界排名 |
| 2012 |
156 |
89 |
| 2011 |
127 |
94 |
| 2010 |
100 |
99 |
| 2009 |
91 |
96 |
| 2008 |
78 |
107 |
| 2007 |
49 |
117 |
| 2006 |
36 |
122 |
| 2005 |
39 |
110 |
| 2004 |
41 |
105 |
| 2003 |
34 |
103 |
| 2002 |
24 |
110 |
| 2001 |
27 |
104 |
| 2000 |
24 |
104 |
| 1999 |
20 |
110 |
| 1998 |
18 |
114 |
| 1997 |
17 |
117 |
| 1996 |
18 |
112 |
| 1995 |
21 |
102 |
| 1994 |
22 |
95 |
| 1993 |
20 |
98 |
| 1992 |
12 |
110 |
| 1991 |
9 |
117 |