| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 24 | 121 |
| 2014 | 25 | 125 |
| 2013 | 25 | 124 |
| 2012 | 25 | 127 |
| 2011 | 21 | 132 |
| 2010 | 18 | 131 |
| 2009 | 14 | 133 |
| 2008 | 13 | 138 |
| 2007 | 11 | 136 |
| 2006 | 10 | 135 |
| 2005 | 11 | 130 |
| 2004 | 10 | 133 |
| 2003 | 9 | 129 |
| 2002 | 7 | 129 |
| 2001 | 10 | 117 |
| 2000 | 9 | 119 |
| 1999 | 11 | 109 |
| 1998 | 9 | 115 |
| 1997 | 9 | 116 |
| 1996 | 9 | 109 |
| 1995 | 10 | 105 |
| 1994 | 9 | 86 |