| 时间 |
值 （亿美元） |
世界排名 |
| 2015 |
4 |
136 |
| 2014 |
4 |
145 |
| 2013 |
5 |
147 |
| 2012 |
5 |
143 |
| 2011 |
4 |
149 |
| 2010 |
3 |
149 |
| 2009 |
3 |
150 |
| 2008 |
3 |
149 |
| 2007 |
3 |
147 |
| 2006 |
2 |
146 |
| 2005 |
2 |
148 |
| 2004 |
2 |
132 |
| 2003 |
2 |
134 |
| 2002 |
2 |
130 |
| 2001 |
2 |
124 |
| 2000 |
2 |
119 |
| 1999 |
2 |
120 |
| 1998 |
2 |
120 |
| 1997 |
2 |
122 |
| 1996 |
2 |
120 |
| 1995 |
2 |
112 |
| 1994 |
2 |
107 |
| 1993 |
1 |
105 |
| 1992 |
1 |
101 |