| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 5 | 135 |
| 2015 | 5 | 160 |
| 2014 | 5 | 164 |
| 2013 | 5 | 168 |
| 2012 | 5 | 169 |
| 2011 | 5 | 171 |
| 2010 | 4 | 174 |
| 2009 | 4 | 173 |
| 2008 | 4 | 173 |
| 2007 | 3 | 175 |
| 2006 | 3 | 173 |
| 2005 | 3 | 173 |
| 2004 | 2 | 174 |
| 2003 | 2 | 173 |
| 2002 | 2 | 173 |
| 2001 | 2 | 173 |
| 2000 | 2 | 171 |
| 1999 | 2 | 164 |
| 1998 | 2 | 164 |
| 1997 | 2 | 165 |
| 1996 | 1 | 164 |
| 1995 | 1 | 165 |
| 1994 | 1 | 147 |