| 时间 |
值 （亿美元） |
世界排名 |
| 2014 |
37 |
77 |
| 2013 |
34 |
78 |
| 2012 |
31 |
81 |
| 2011 |
26 |
82 |
| 2010 |
19 |
89 |
| 2009 |
17 |
89 |
| 2008 |
15 |
96 |
| 2007 |
14 |
94 |
| 2006 |
13 |
92 |
| 2005 |
11 |
90 |
| 2004 |
8 |
92 |
| 2003 |
5 |
96 |
| 2002 |
6 |
90 |
| 2001 |
5 |
86 |
| 2000 |
4 |
91 |
| 1999 |
3 |
100 |
| 1998 |
2 |
110 |
| 1997 |
1 |
112 |
| 1996 |
2 |
103 |
| 1995 |
1 |
109 |
| 1994 |
0 |
120 |
| 1993 |
1 |
114 |
| 1992 |
0 |
111 |