| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 46 | 89 |
| 2015 | 40 | 106 |
| 2014 | 38 | 109 |
| 2013 | 36 | 113 |
| 2012 | 33 | 114 |
| 2011 | 27 | 121 |
| 2010 | 22 | 125 |
| 2009 | 15 | 131 |
| 2008 | 15 | 131 |
| 2007 | 11 | 139 |
| 2006 | 9 | 138 |
| 2005 | 6 | 138 |
| 2004 | 5 | 148 |
| 2003 | 4 | 142 |
| 2002 | 3 | 143 |
| 2001 | 3 | 143 |
| 2000 | 3 | 142 |
| 1999 | 3 | 135 |
| 1998 | 3 | 141 |
| 1997 | 4 | 134 |
| 1996 | 4 | 131 |
| 1995 | 3 | 133 |
| 1994 | 3 | 119 |
| 1993 | 2 | 123 |
| 1992 | 2 | 121 |
| 1991 | 2 | 121 |
| 1990 | 1 | 118 |
| 1989 | 1 | 103 |