| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 61 | 53 |
| 2015 | 57 | 69 |
| 2014 | 70 | 63 |
| 2013 | 64 | 63 |
| 2012 | 59 | 65 |
| 2011 | 56 | 61 |
| 2010 | 47 | 66 |
| 2009 | 46 | 62 |
| 2008 | 51 | 62 |
| 2007 | 44 | 60 |
| 2006 | 35 | 64 |
| 2005 | 32 | 60 |
| 2004 | 29 | 58 |
| 2003 | 24 | 59 |
| 2002 | 19 | 61 |
| 2001 | 18 | 57 |
| 2000 | 16 | 60 |
| 1999 | 16 | 58 |
| 1998 | 16 | 55 |
| 1997 | 14 | 60 |
| 1996 | 12 | 63 |
| 1995 | 9 | 61 |
| 1994 | 6 | 70 |
| 1993 | 3 | 79 |
| 1992 | 2 | 81 |