| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2014 | 73 | 113 |
| 2013 | 66 | 113 |
| 2012 | 65 | 117 |
| 2011 | 70 | 109 |
| 2010 | 55 | 108 |
| 2009 | 51 | 105 |
| 2008 | 69 | 103 |
| 2007 | 53 | 106 |
| 2006 | 38 | 108 |
| 2005 | 32 | 108 |
| 2004 | 29 | 108 |
| 2003 | 23 | 108 |
| 2002 | 20 | 106 |
| 2001 | 17 | 118 |
| 2000 | 21 | 103 |
| 1999 | 18 | 107 |
| 1998 | 19 | 106 |
| 1997 | 18 | 107 |
| 1996 | 16 | 107 |
| 1995 | 17 | 99 |
| 1994 | 15 | 100 |
| 1993 | 12 | 100 |
| 1992 | 12 | 97 |