| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 30 | 125 |
| 2015 | 35 | 141 |
| 2014 | 35 | 142 |
| 2013 | 41 | 143 |
| 2012 | 42 | 142 |
| 2011 | 32 | 144 |
| 2010 | 27 | 145 |
| 2009 | 21 | 148 |
| 2008 | 27 | 143 |
| 2007 | 20 | 149 |
| 2006 | 16 | 148 |
| 2005 | 18 | 143 |
| 2004 | 12 | 148 |
| 2003 | 7 | 156 |
| 2002 | 6 | 159 |
| 2001 | 6 | 151 |
| 2000 | 6 | 151 |
| 1999 | 5 | 152 |
| 1998 | 5 | 151 |
| 1997 | 6 | 149 |
| 1996 | 7 | 148 |
| 1995 | 7 | 145 |
| 1994 | 5 | 141 |
| 1993 | 4 | 142 |
| 1992 | 4 | 135 |
| 1991 | 6 | 132 |
| 1990 | 6 | 126 |
| 1989 | 6 | 108 |
| 1988 | 6 | 102 |
| 1987 | 6 | 101 |
| 1986 | 6 | 95 |