| 时间 |
值 （亿美元） |
世界排名 |
| 2015 |
5 |
133 |
| 2014 |
5 |
133 |
| 2013 |
5 |
136 |
| 2012 |
5 |
136 |
| 2011 |
6 |
133 |
| 2010 |
5 |
135 |
| 2009 |
4 |
133 |
| 2008 |
4 |
137 |
| 2007 |
4 |
141 |
| 2006 |
3 |
141 |
| 2005 |
3 |
140 |
| 2004 |
3 |
137 |
| 2003 |
3 |
136 |
| 2002 |
3 |
131 |
| 2001 |
3 |
128 |
| 2000 |
4 |
122 |
| 1999 |
5 |
117 |
| 1998 |
5 |
118 |
| 1997 |
4 |
120 |
| 1996 |
4 |
121 |
| 1995 |
4 |
122 |
| 1994 |
4 |
101 |