| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 42 | 53 |
| 2015 | 39 | 76 |
| 2014 | 48 | 72 |
| 2013 | 47 | 72 |
| 2012 | 40 | 76 |
| 2011 | 38 | 73 |
| 2010 | 29 | 78 |
| 2009 | 26 | 76 |
| 2008 | 33 | 73 |
| 2007 | 30 | 72 |
| 2006 | 24 | 71 |
| 2005 | 22 | 70 |
| 2004 | 17 | 71 |
| 2003 | 14 | 71 |
| 2002 | 11 | 75 |
| 2001 | 9 | 73 |
| 2000 | 9 | 74 |
| 1999 | 8 | 75 |
| 1998 | 8 | 75 |
| 1997 | 7 | 83 |
| 1996 | 5 | 87 |
| 1995 | 4 | 86 |
| 1994 | 3 | 86 |
| 1993 | 2 | 98 |
| 1992 | 1 | 103 |