| 时间 |
值 （亿美元） |
世界排名 |
| 2016 |
18 |
130 |
| 2015 |
15 |
136 |
| 2014 |
15 |
143 |
| 2013 |
15 |
145 |
| 2012 |
14 |
145 |
| 2011 |
13 |
145 |
| 2010 |
10 |
146 |
| 2009 |
7 |
154 |
| 2008 |
11 |
145 |
| 2007 |
12 |
142 |
| 2006 |
10 |
139 |
| 2005 |
10 |
133 |
| 2004 |
7 |
138 |
| 2003 |
7 |
131 |
| 2002 |
5 |
135 |
| 2001 |
3 |
147 |
| 2000 |
3 |
152 |
| 1999 |
2 |
159 |
| 1998 |
2 |
156 |
| 1997 |
2 |
152 |
| 1996 |
3 |
148 |
| 1995 |
3 |
148 |
| 1994 |
2 |
148 |