| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 41936 | 18 |
| 2015 | 41177 | 19 |
| 2014 | 47903 | 19 |
| 2013 | 46531 | 22 |
| 2012 | 44065 | 25 |
| 2011 | 46810 | 25 |
| 2010 | 41786 | 23 |
| 2009 | 41733 | 20 |
| 2008 | 45699 | 26 |
| 2007 | 41815 | 27 |
| 2006 | 36448 | 29 |
| 2005 | 34697 | 29 |
| 2004 | 34166 | 26 |
| 2003 | 30360 | 26 |
| 2002 | 25205 | 24 |
| 2001 | 23687 | 24 |
| 2000 | 23719 | 24 |
| 1999 | 26796 | 18 |
| 1998 | 27341 | 15 |
| 1997 | 27046 | 14 |
| 1996 | 30564 | 10 |
| 1995 | 31730 | 9 |
| 1994 | 27088 | 10 |
| 1993 | 25489 | 10 |
| 1992 | 26334 | 11 |
| 1991 | 23269 | 14 |
| 1990 | 22220 | 14 |
| 1989 | 17697 | 17 |
| 1988 | 17863 | 15 |
| 1987 | 16614 | 14 |
| 1986 | 13411 | 17 |