| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 36855 | 25 |
| 2015 | 36527 | 24 |
| 2014 | 42955 | 26 |
| 2013 | 42554 | 28 |
| 2012 | 40838 | 29 |
| 2011 | 43810 | 28 |
| 2010 | 40703 | 26 |
| 2009 | 41631 | 21 |
| 2008 | 45413 | 27 |
| 2007 | 41601 | 28 |
| 2006 | 36545 | 28 |
| 2005 | 34880 | 28 |
| 2004 | 33875 | 27 |
| 2003 | 29691 | 27 |
| 2002 | 24275 | 28 |
| 2001 | 22527 | 26 |
| 2000 | 22466 | 27 |
| 1999 | 24799 | 23 |
| 1998 | 25101 | 21 |
| 1997 | 24359 | 21 |
| 1996 | 27015 | 18 |
| 1995 | 27038 | 15 |
| 1994 | 23626 | 17 |
| 1993 | 22503 | 16 |
| 1992 | 23937 | 15 |
| 1991 | 21782 | 17 |
| 1990 | 21795 | 15 |
| 1989 | 17705 | 16 |
| 1988 | 17697 | 16 |
| 1987 | 16324 | 17 |
| 1986 | 13557 | 16 |