| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 87 | 90 |
| 2015 | 87 | 105 |
| 2014 | 100 | 104 |
| 2013 | 97 | 105 |
| 2012 | 93 | 105 |
| 2011 | 99 | 101 |
| 2010 | 91 | 100 |
| 2009 | 93 | 95 |
| 2008 | 97 | 97 |
| 2007 | 79 | 96 |
| 2006 | 65 | 97 |
| 2005 | 59 | 97 |
| 2004 | 53 | 94 |
| 2003 | 46 | 95 |
| 2002 | 37 | 98 |
| 2001 | 31 | 99 |
| 2000 | 31 | 99 |
| 1999 | 21 | 109 |
| 1998 | 16 | 119 |
| 1997 | 14 | 122 |
| 1996 | 10 | 127 |
| 1995 | 10 | 123 |
| 1994 | 5 | 120 |