| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 37622 | 23 |
| 2015 | 39102 | 22 |
| 2014 | 44450 | 24 |
| 2013 | 43351 | 26 |
| 2012 | 42112 | 27 |
| 2011 | 40462 | 31 |
| 2010 | 35049 | 33 |
| 2009 | 33073 | 32 |
| 2008 | 45759 | 25 |
| 2007 | 42673 | 26 |
| 2006 | 42372 | 21 |
| 2005 | 39440 | 19 |
| 2004 | 36161 | 22 |
| 2003 | 33231 | 18 |
| 2002 | 31311 | 13 |
| 2001 | 31062 | 10 |
| 2000 | 33071 | 10 |
| 1999 | 28260 | 14 |
| 1998 | 26663 | 17 |
| 1997 | 29200 | 11 |
| 1996 | 28616 | 15 |
| 1995 | 26847 | 17 |
| 1994 | 25467 | 13 |
| 1993 | 25199 | 11 |
| 1992 | 25994 | 12 |
| 1991 | 26168 | 11 |
| 1990 | 27256 | 8 |
| 1989 | 23613 | 10 |
| 1988 | 21908 | 12 |
| 1987 | 23313 | 4 |
| 1986 | 23056 | 4 |