| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 24 | 103 |
| 2015 | 22 | 125 |
| 2014 | 23 | 127 |
| 2013 | 22 | 132 |
| 2012 | 25 | 125 |
| 2011 | 26 | 124 |
| 2010 | 19 | 130 |
| 2009 | 15 | 130 |
| 2008 | 12 | 139 |
| 2007 | 12 | 135 |
| 2006 | 9 | 137 |
| 2005 | 9 | 133 |
| 2004 | 9 | 134 |
| 2003 | 8 | 131 |
| 2002 | 5 | 134 |
| 2001 | 5 | 132 |
| 2000 | 5 | 131 |
| 1999 | 7 | 123 |
| 1998 | 5 | 127 |
| 1997 | 5 | 127 |
| 1996 | 5 | 124 |
| 1995 | 5 | 124 |
| 1994 | 4 | 110 |
| 1993 | 5 | 103 |
| 1992 | 5 | 104 |
| 1991 | 6 | 100 |
| 1990 | 6 | 97 |
| 1989 | 6 | 82 |
| 1988 | 6 | 82 |
| 1987 | 5 | 81 |
| 1986 | 4 | 80 |