| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 3 | 163 |
| 2014 | 3 | 168 |
| 2013 | 3 | 174 |
| 2012 | 3 | 176 |
| 2011 | 3 | 177 |
| 2010 | 2 | 178 |
| 2009 | 2 | 177 |
| 2008 | 2 | 178 |
| 2007 | 2 | 179 |
| 2006 | 2 | 179 |
| 2005 | 2 | 178 |
| 2004 | 2 | 179 |
| 2003 | 1 | 178 |
| 2002 | 1 | 177 |
| 2001 | 1 | 177 |
| 2000 | 1 | 177 |
| 1999 | 1 | 169 |
| 1998 | 1 | 169 |
| 1997 | 1 | 171 |
| 1996 | 1 | 167 |
| 1995 | 1 | 167 |
| 1994 | 1 | 150 |
| 1993 | 1 | 141 |
| 1992 | 1 | 137 |
| 1991 | 1 | 134 |
| 1990 | 1 | 132 |
| 1989 | 1 | 117 |
| 1988 | 1 | 113 |
| 1987 | 1 | 111 |
| 1986 | 1 | 109 |