| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 46 | 56 |
| 2015 | 44 | 73 |
| 2014 | 51 | 70 |
| 2013 | 51 | 67 |
| 2012 | 48 | 67 |
| 2011 | 48 | 67 |
| 2010 | 40 | 69 |
| 2009 | 44 | 64 |
| 2008 | 53 | 60 |
| 2007 | 44 | 61 |
| 2006 | 30 | 66 |
| 2005 | 25 | 67 |
| 2004 | 20 | 69 |
| 2003 | 17 | 66 |
| 2002 | 12 | 76 |
| 2001 | 11 | 76 |
| 2000 | 10 | 75 |
| 1999 | 12 | 68 |
| 1998 | 12 | 66 |
| 1997 | 11 | 65 |
| 1996 | 12 | 61 |
| 1995 | 7 | 67 |
| 1994 | 7 | 66 |
| 1993 | 5 | 69 |
| 1992 | 3 | 77 |