| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 25058 | 30 |
| 2015 | 23819 | 34 |
| 2014 | 26181 | 36 |
| 2013 | 23930 | 42 |
| 2012 | 21931 | 47 |
| 2011 | 22822 | 47 |
| 2010 | 21088 | 47 |
| 2009 | 20676 | 46 |
| 2008 | 21929 | 51 |
| 2007 | 19376 | 50 |
| 2006 | 16672 | 52 |
| 2005 | 15835 | 51 |
| 2004 | 15109 | 51 |
| 2003 | 13690 | 51 |
| 2002 | 11844 | 50 |
| 2001 | 11022 | 48 |
| 2000 | 11039 | 50 |
| 1999 | 10649 | 50 |
| 1998 | 10184 | 49 |
| 1997 | 9680 | 48 |
| 1996 | 9398 | 49 |
| 1995 | 9114 | 48 |
| 1994 | 8001 | 47 |
| 1993 | 7296 | 48 |
| 1992 | 8220 | 44 |
| 1991 | 7558 | 45 |
| 1990 | 7192 | 48 |
| 1989 | 6041 | 48 |
| 1988 | 5814 | 46 |
| 1987 | 5084 | 46 |
| 1986 | 4195 | 48 |