| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 51600 | 11 |
| 2015 | 50585 | 12 |
| 2014 | 59180 | 10 |
| 2013 | 60283 | 11 |
| 2012 | 57134 | 11 |
| 2011 | 59593 | 12 |
| 2010 | 52076 | 11 |
| 2009 | 46207 | 16 |
| 2008 | 55747 | 13 |
| 2007 | 53324 | 14 |
| 2006 | 46256 | 15 |
| 2005 | 43085 | 14 |
| 2004 | 42442 | 12 |
| 2003 | 36961 | 13 |
| 2002 | 29572 | 18 |
| 2001 | 26969 | 17 |
| 2000 | 29283 | 14 |
| 1999 | 30577 | 13 |
| 1998 | 30144 | 12 |
| 1997 | 29898 | 10 |
| 1996 | 32587 | 9 |
| 1995 | 29914 | 11 |
| 1994 | 25747 | 11 |
| 1993 | 24081 | 12 |
| 1992 | 32339 | 5 |
| 1991 | 31374 | 5 |
| 1990 | 30162 | 5 |
| 1989 | 25300 | 6 |
| 1988 | 24189 | 9 |
| 1987 | 21485 | 9 |
| 1986 | 17727 | 9 |