| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 77 | 94 |
| 2015 | 70 | 114 |
| 2014 | 65 | 116 |
| 2013 | 57 | 122 |
| 2012 | 51 | 123 |
| 2011 | 47 | 128 |
| 2010 | 42 | 127 |
| 2009 | 39 | 125 |
| 2008 | 39 | 125 |
| 2007 | 32 | 127 |
| 2006 | 27 | 127 |
| 2005 | 24 | 129 |
| 2004 | 20 | 129 |
| 2003 | 17 | 128 |
| 2002 | 16 | 124 |
| 2001 | 15 | 124 |
| 2000 | 13 | 125 |
| 1999 | 12 | 125 |
| 1998 | 11 | 128 |
| 1997 | 12 | 125 |
| 1996 | 12 | 121 |
| 1995 | 11 | 120 |
| 1994 | 10 | 106 |
| 1993 | 10 | 105 |