| 时间 |
值 （亿美元） |
世界排名 |
| 2015 |
1 |
142 |
| 2014 |
2 |
151 |
| 2013 |
2 |
159 |
| 2012 |
3 |
150 |
| 2011 |
3 |
152 |
| 2010 |
2 |
150 |
| 2009 |
2 |
150 |
| 2008 |
2 |
150 |
| 2007 |
2 |
150 |
| 2006 |
1 |
149 |
| 2005 |
1 |
143 |
| 2004 |
2 |
130 |
| 2003 |
2 |
130 |
| 2002 |
2 |
121 |
| 2001 |
2 |
115 |
| 2000 |
2 |
116 |
| 1999 |
1 |
117 |
| 1998 |
1 |
113 |
| 1997 |
1 |
113 |
| 1996 |
1 |
108 |
| 1995 |
1 |
104 |
| 1994 |
1 |
101 |
| 1993 |
1 |
100 |
| 1992 |
1 |
95 |