| 时间 |
值 （亿美元） |
世界排名 |
| 2016 |
9 |
148 |
| 2015 |
9 |
151 |
| 2014 |
10 |
152 |
| 2013 |
12 |
149 |
| 2012 |
14 |
146 |
| 2011 |
13 |
146 |
| 2010 |
12 |
142 |
| 2009 |
10 |
143 |
| 2008 |
14 |
138 |
| 2007 |
15 |
131 |
| 2006 |
14 |
130 |
| 2005 |
9 |
134 |
| 2004 |
9 |
132 |
| 2003 |
8 |
128 |
| 2002 |
7 |
127 |
| 2001 |
7 |
130 |
| 2000 |
8 |
124 |
| 1999 |
7 |
122 |
| 1998 |
6 |
123 |
| 1997 |
7 |
119 |
| 1996 |
8 |
117 |
| 1995 |
8 |
118 |
| 1994 |
5 |
124 |