| 时间 |
值 （亿美元） |
世界排名 |
| 2016 |
8 |
109 |
| 2015 |
8 |
122 |
| 2014 |
10 |
122 |
| 2013 |
10 |
121 |
| 2012 |
9 |
121 |
| 2011 |
10 |
122 |
| 2010 |
9 |
117 |
| 2009 |
9 |
119 |
| 2008 |
11 |
115 |
| 2007 |
10 |
113 |
| 2006 |
7 |
119 |
| 2005 |
6 |
120 |
| 2004 |
6 |
120 |
| 2003 |
5 |
125 |
| 2002 |
4 |
121 |
| 2001 |
4 |
125 |
| 2000 |
4 |
127 |
| 1999 |
3 |
131 |
| 1998 |
3 |
132 |
| 1997 |
3 |
130 |
| 1996 |
4 |
123 |
| 1995 |
5 |
116 |