| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 67 | 97 |
| 2015 | 63 | 118 |
| 2014 | 58 | 122 |
| 2013 | 53 | 126 |
| 2012 | 51 | 126 |
| 2011 | 47 | 127 |
| 2010 | 45 | 124 |
| 2009 | 45 | 121 |
| 2008 | 45 | 122 |
| 2007 | 40 | 122 |
| 2006 | 36 | 120 |
| 2005 | 32 | 119 |
| 2004 | 29 | 116 |
| 2003 | 28 | 110 |
| 2002 | 26 | 107 |
| 2001 | 27 | 102 |
| 2000 | 25 | 105 |
| 1999 | 24 | 100 |
| 1998 | 23 | 101 |
| 1997 | 21 | 107 |
| 1996 | 20 | 107 |
| 1995 | 20 | 102 |
| 1994 | 19 | 82 |