| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 76 | 98 |
| 2015 | 75 | 117 |
| 2014 | 72 | 123 |
| 2013 | 68 | 128 |
| 2012 | 63 | 130 |
| 2011 | 57 | 130 |
| 2010 | 53 | 123 |
| 2009 | 49 | 120 |
| 2008 | 46 | 128 |
| 2007 | 43 | 125 |
| 2006 | 37 | 119 |
| 2005 | 36 | 115 |
| 2004 | 31 | 116 |
| 2003 | 25 | 120 |
| 2002 | 22 | 115 |
| 2001 | 27 | 105 |
| 2000 | 29 | 101 |
| 1999 | 34 | 93 |
| 1998 | 29 | 100 |
| 1997 | 27 | 101 |
| 1996 | 25 | 101 |
| 1995 | 24 | 96 |
| 1994 | 20 | 96 |