| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 53 | 98 |
| 2015 | 51 | 104 |
| 2014 | 59 | 105 |
| 2013 | 57 | 105 |
| 2012 | 52 | 108 |
| 2011 | 59 | 107 |
| 2010 | 48 | 108 |
| 2009 | 40 | 107 |
| 2008 | 50 | 106 |
| 2007 | 42 | 107 |
| 2006 | 33 | 111 |
| 2005 | 24 | 111 |
| 2004 | 18 | 118 |
| 2003 | 13 | 116 |
| 2002 | 10 | 120 |
| 2001 | 10 | 117 |
| 2000 | 11 | 114 |
| 1999 | 8 | 119 |
| 1998 | 6 | 120 |
| 1997 | 6 | 131 |
| 1996 | 3 | 144 |
| 1995 | 2 | 160 |
| 1994 | 1 | 164 |
| 1993 | 1 | 148 |
| 1992 | 3 | 128 |