| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 78 | 109 |
| 2014 | 79 | 114 |
| 2013 | 77 | 115 |
| 2012 | 69 | 116 |
| 2011 | 63 | 115 |
| 2010 | 52 | 118 |
| 2009 | 42 | 123 |
| 2008 | 39 | 126 |
| 2007 | 33 | 126 |
| 2006 | 30 | 124 |
| 2005 | 28 | 121 |
| 2004 | 25 | 122 |
| 2003 | 24 | 117 |
| 2002 | 23 | 111 |
| 2001 | 23 | 112 |
| 2000 | 24 | 109 |
| 1999 | 22 | 108 |
| 1998 | 21 | 109 |
| 1997 | 20 | 109 |
| 1996 | 17 | 112 |
| 1995 | 17 | 110 |
| 1994 | 15 | 95 |