| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 7 | 113 |
| 2015 | 6 | 130 |
| 2014 | 7 | 130 |
| 2013 | 6 | 133 |
| 2012 | 5 | 134 |
| 2011 | 5 | 137 |
| 2010 | 5 | 136 |
| 2009 | 4 | 134 |
| 2008 | 4 | 136 |
| 2007 | 4 | 139 |
| 2006 | 3 | 139 |
| 2005 | 3 | 138 |
| 2004 | 3 | 140 |
| 2003 | 2 | 139 |
| 2002 | 2 | 140 |
| 2001 | 2 | 140 |
| 2000 | 2 | 139 |
| 1999 | 2 | 136 |
| 1998 | 2 | 135 |
| 1997 | 2 | 137 |
| 1996 | 2 | 131 |
| 1995 | 2 | 133 |
| 1994 | 2 | 119 |
| 1993 | 2 | 113 |
| 1992 | 3 | 104 |
| 1991 | 3 | 103 |
| 1990 | 4 | 99 |
| 1989 | 3 | 87 |
| 1988 | 3 | 88 |
| 1987 | 3 | 86 |
| 1986 | 2 | 84 |