| 时间 |
值 （亿美元） |
世界排名 |
| 2016 |
1 |
128 |
| 2015 |
1 |
152 |
| 2014 |
2 |
150 |
| 2013 |
2 |
154 |
| 2012 |
2 |
152 |
| 2011 |
2 |
156 |
| 2010 |
1 |
156 |
| 2009 |
1 |
155 |
| 2008 |
2 |
151 |
| 2007 |
2 |
149 |
| 2006 |
1 |
154 |
| 2005 |
1 |
153 |
| 2004 |
2 |
145 |
| 2003 |
1 |
147 |
| 2002 |
2 |
143 |
| 2001 |
1 |
145 |
| 2000 |
1 |
147 |
| 1999 |
2 |
143 |
| 1998 |
2 |
141 |
| 1997 |
1 |
143 |
| 1996 |
2 |
138 |
| 1995 |
2 |
137 |