| 时间 |
值 （亿美元） |
世界排名 |
| 2016 |
10 |
69 |
| 2015 |
9 |
114 |
| 2014 |
11 |
119 |
| 2013 |
11 |
117 |
| 2012 |
10 |
121 |
| 2011 |
10 |
115 |
| 2010 |
8 |
117 |
| 2009 |
8 |
116 |
| 2008 |
10 |
112 |
| 2007 |
7 |
115 |
| 2006 |
5 |
114 |
| 2005 |
4 |
113 |
| 2004 |
4 |
110 |
| 2003 |
3 |
114 |
| 2002 |
2 |
114 |
| 2001 |
2 |
114 |
| 2000 |
2 |
114 |
| 1999 |
1 |
119 |
| 1998 |
2 |
112 |
| 1997 |
2 |
109 |
| 1996 |
1 |
116 |
| 1995 |
1 |
102 |
| 1994 |
0 |
127 |