| 时间 |
值 （亿美元） |
世界排名 |
| 2016 |
6 |
114 |
| 2015 |
7 |
127 |
| 2014 |
8 |
126 |
| 2013 |
8 |
129 |
| 2012 |
7 |
130 |
| 2011 |
8 |
130 |
| 2010 |
5 |
132 |
| 2009 |
4 |
136 |
| 2008 |
6 |
129 |
| 2007 |
7 |
126 |
| 2006 |
5 |
132 |
| 2005 |
4 |
132 |
| 2004 |
4 |
130 |
| 2003 |
4 |
130 |
| 2002 |
3 |
132 |
| 2001 |
3 |
133 |
| 2000 |
2 |
134 |
| 1999 |
2 |
134 |
| 1998 |
3 |
131 |
| 1997 |
2 |
133 |
| 1996 |
2 |
133 |
| 1995 |
2 |
132 |