| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 11 | 101 |
| 2015 | 12 | 110 |
| 2014 | 11 | 117 |
| 2013 | 10 | 122 |
| 2012 | 9 | 122 |
| 2011 | 9 | 124 |
| 2010 | 7 | 127 |
| 2009 | 6 | 128 |
| 2008 | 6 | 128 |
| 2007 | 5 | 132 |
| 2006 | 5 | 127 |
| 2005 | 5 | 130 |
| 2004 | 4 | 133 |
| 2003 | 3 | 131 |
| 2002 | 4 | 127 |
| 2001 | 4 | 124 |
| 2000 | 4 | 124 |
| 1999 | 4 | 124 |
| 1998 | 4 | 125 |
| 1997 | 4 | 123 |
| 1996 | 5 | 119 |
| 1995 | 4 | 119 |
| 1994 | 4 | 102 |
| 1993 | 4 | 100 |
| 1992 | 5 | 94 |
| 1991 | 6 | 91 |
| 1990 | 6 | 90 |
| 1989 | 5 | 78 |
| 1988 | 5 | 77 |
| 1987 | 6 | 70 |
| 1986 | 6 | 66 |