| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 53 | 86 |
| 2015 | 55 | 98 |
| 2014 | 64 | 100 |
| 2013 | 64 | 101 |
| 2012 | 61 | 99 |
| 2011 | 61 | 101 |
| 2010 | 51 | 103 |
| 2009 | 56 | 94 |
| 2008 | 79 | 85 |
| 2007 | 67 | 84 |
| 2006 | 45 | 91 |
| 2005 | 34 | 92 |
| 2004 | 31 | 89 |
| 2003 | 25 | 92 |
| 2002 | 22 | 92 |
| 2001 | 19 | 98 |
| 2000 | 19 | 98 |
| 1999 | 19 | 93 |
| 1998 | 19 | 92 |
| 1997 | 18 | 93 |
| 1996 | 16 | 94 |
| 1995 | 16 | 92 |