| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 7 | 131 |
| 2015 | 6 | 158 |
| 2014 | 7 | 161 |
| 2013 | 5 | 167 |
| 2012 | 7 | 167 |
| 2011 | 7 | 168 |
| 2010 | 6 | 168 |
| 2009 | 6 | 164 |
| 2008 | 6 | 166 |
| 2007 | 5 | 168 |
| 2006 | 4 | 168 |
| 2005 | 4 | 165 |
| 2004 | 4 | 166 |
| 2003 | 3 | 164 |
| 2002 | 3 | 164 |
| 2001 | 3 | 164 |
| 2000 | 3 | 161 |
| 1999 | 3 | 157 |
| 1998 | 3 | 159 |
| 1997 | 3 | 158 |
| 1996 | 3 | 153 |
| 1995 | 3 | 150 |
| 1994 | 3 | 135 |
| 1993 | 4 | 122 |
| 1992 | 4 | 118 |
| 1991 | 4 | 117 |
| 1990 | 4 | 113 |
| 1989 | 4 | 95 |
| 1988 | 4 | 96 |
| 1987 | 4 | 95 |
| 1986 | 4 | 92 |