| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 50 | 117 |
| 2015 | 55 | 119 |
| 2014 | 66 | 119 |
| 2013 | 62 | 119 |
| 2012 | 55 | 124 |
| 2011 | 50 | 128 |
| 2010 | 40 | 125 |
| 2009 | 29 | 133 |
| 2008 | 31 | 138 |
| 2007 | 25 | 137 |
| 2006 | 20 | 134 |
| 2005 | 13 | 145 |
| 2004 | 10 | 149 |
| 2003 | 8 | 147 |
| 2002 | 7 | 148 |
| 2001 | 7 | 145 |
| 2000 | 5 | 159 |
| 1999 | 8 | 137 |
| 1998 | 7 | 144 |
| 1997 | 9 | 131 |
| 1996 | 16 | 108 |
| 1995 | 7 | 138 |
| 1994 | 6 | 132 |
| 1993 | 6 | 121 |
| 1992 | 5 | 131 |
| 1991 | 6 | 116 |
| 1990 | 6 | 116 |
| 1989 | 5 | 118 |
| 1988 | 6 | 116 |
| 1987 | 5 | 112 |
| 1986 | 6 | 107 |