| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 131 | 81 |
| 2015 | 119 | 97 |
| 2014 | 112 | 104 |
| 2013 | 103 | 108 |
| 2012 | 88 | 112 |
| 2011 | 76 | 116 |
| 2010 | 67 | 110 |
| 2009 | 58 | 110 |
| 2008 | 70 | 112 |
| 2007 | 63 | 108 |
| 2006 | 55 | 104 |
| 2005 | 46 | 105 |
| 2004 | 38 | 108 |
| 2003 | 31 | 105 |
| 2002 | 28 | 104 |
| 2001 | 24 | 106 |
| 2000 | 23 | 107 |
| 1999 | 19 | 114 |
| 1998 | 14 | 124 |
| 1997 | 16 | 119 |
| 1996 | 15 | 119 |
| 1995 | 16 | 113 |
| 1994 | 11 | 120 |
| 1993 | 8 | 123 |