| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 3 | 169 |
| 2014 | 6 | 161 |
| 2013 | 6 | 161 |
| 2012 | 5 | 168 |
| 2011 | 4 | 168 |
| 2010 | 2 | 168 |
| 2009 | 1 | 170 |
| 2008 | 2 | 167 |
| 2007 | 2 | 167 |
| 2006 | 2 | 168 |
| 2005 | 1 | 166 |
| 2004 | 1 | 169 |
| 2003 | 1 | 166 |
| 2002 | 2 | 161 |
| 2001 | 1 | 163 |
| 2000 | 3 | 149 |
| 1999 | 5 | 134 |
| 1998 | 4 | 140 |
| 1997 | 4 | 139 |
| 1996 | 6 | 124 |
| 1995 | 8 | 116 |
| 1994 | 4 | 136 |
| 1993 | 4 | 115 |
| 1992 | 6 | 105 |
| 1991 | 3 | 119 |
| 1990 | 9 | 97 |
| 1989 | 5 | 109 |
| 1988 | 4 | 109 |
| 1987 | 4 | 106 |
| 1986 | 4 | 105 |