| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 49 | 129 |
| 2014 | 65 | 126 |
| 2013 | 67 | 129 |
| 2012 | 63 | 131 |
| 2011 | 51 | 134 |
| 2010 | 39 | 135 |
| 2009 | 37 | 135 |
| 2008 | 48 | 126 |
| 2007 | 32 | 135 |
| 2006 | 22 | 138 |
| 2005 | 14 | 147 |
| 2004 | 11 | 151 |
| 2003 | 9 | 150 |
| 2002 | 7 | 152 |
| 2001 | 6 | 154 |
| 2000 | 7 | 145 |
| 1999 | 7 | 145 |
| 1998 | 10 | 137 |
| 1997 | 8 | 143 |
| 1996 | 10 | 133 |
| 1995 | 7 | 141 |
| 1994 | 7 | 136 |
| 1993 | 8 | 121 |
| 1992 | 11 | 111 |
| 1991 | 9 | 113 |
| 1990 | 13 | 104 |