| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 53 | 87 |
| 2015 | 53 | 99 |
| 2014 | 65 | 99 |
| 2013 | 63 | 102 |
| 2012 | 58 | 103 |
| 2011 | 59 | 103 |
| 2010 | 48 | 104 |
| 2009 | 46 | 103 |
| 2008 | 64 | 93 |
| 2007 | 60 | 88 |
| 2006 | 46 | 89 |
| 2005 | 37 | 90 |
| 2004 | 31 | 90 |
| 2003 | 26 | 91 |
| 2002 | 19 | 102 |
| 2001 | 16 | 102 |
| 2000 | 14 | 102 |
| 1999 | 14 | 100 |
| 1998 | 14 | 98 |
| 1997 | 13 | 100 |
| 1996 | 13 | 99 |
| 1995 | 12 | 97 |