| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 67 | 78 |
| 2015 | 65 | 96 |
| 2014 | 76 | 97 |
| 2013 | 69 | 100 |
| 2012 | 60 | 100 |
| 2011 | 67 | 98 |
| 2010 | 61 | 95 |
| 2009 | 59 | 93 |
| 2008 | 75 | 86 |
| 2007 | 76 | 82 |
| 2006 | 58 | 83 |
| 2005 | 55 | 81 |
| 2004 | 54 | 76 |
| 2003 | 48 | 75 |
| 2002 | 38 | 77 |
| 2001 | 35 | 78 |
| 2000 | 35 | 78 |
| 1999 | 38 | 70 |
| 1998 | 38 | 71 |
| 1997 | 36 | 70 |
| 1996 | 38 | 67 |
| 1995 | 41 | 66 |