| 时间 |
值 （亿美元） |
世界排名 |
| 2016 |
3 |
184 |
| 2015 |
2 |
189 |
| 2014 |
2 |
193 |
| 2013 |
2 |
193 |
| 2012 |
2 |
193 |
| 2011 |
2 |
194 |
| 2010 |
2 |
189 |
| 2009 |
2 |
189 |
| 2008 |
2 |
190 |
| 2007 |
1 |
189 |
| 2006 |
1 |
186 |
| 2005 |
1 |
184 |
| 2004 |
1 |
185 |
| 2003 |
1 |
183 |
| 2002 |
1 |
182 |
| 2001 |
1 |
181 |
| 2000 |
1 |
182 |
| 1999 |
1 |
184 |
| 1998 |
1 |
180 |
| 1997 |
1 |
180 |
| 1996 |
1 |
182 |
| 1995 |
1 |
184 |
| 1994 |
1 |
179 |