| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 96 | 84 |
| 2014 | 111 | 84 |
| 2013 | 121 | 85 |
| 2012 | 103 | 85 |
| 2011 | 115 | 84 |
| 2010 | 93 | 85 |
| 2009 | 102 | 76 |
| 2008 | 119 | 77 |
| 2007 | 95 | 78 |
| 2006 | 75 | 80 |
| 2005 | 64 | 79 |
| 2004 | 63 | 72 |
| 2003 | 57 | 71 |
| 2002 | 45 | 71 |
| 2001 | 36 | 77 |
| 2000 | 20 | 96 |
| 1999 | 51 | 64 |
| 1998 | 54 | 66 |
| 1997 | 69 | 58 |
| 1996 | 65 | 58 |
| 1995 | 56 | 60 |