| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 59 | 83 |
| 2015 | 50 | 102 |
| 2014 | 43 | 106 |
| 2013 | 37 | 112 |
| 2012 | 32 | 115 |
| 2011 | 28 | 120 |
| 2010 | 25 | 117 |
| 2009 | 23 | 116 |
| 2008 | 23 | 120 |
| 2007 | 22 | 119 |
| 2006 | 19 | 117 |
| 2005 | 16 | 115 |
| 2004 | 14 | 120 |
| 2003 | 12 | 116 |
| 2002 | 10 | 113 |
| 2001 | 9 | 120 |
| 2000 | 8 | 123 |
| 1999 | 6 | 124 |
| 1998 | 5 | 126 |
| 1997 | 6 | 124 |
| 1996 | 5 | 121 |
| 1995 | 5 | 121 |
| 1994 | 4 | 111 |
| 1993 | 3 | 112 |