| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 18104 | 38 |
| 2015 | 18008 | 41 |
| 2014 | 21674 | 43 |
| 2013 | 21875 | 46 |
| 2012 | 22243 | 44 |
| 2011 | 25916 | 40 |
| 2010 | 26918 | 39 |
| 2009 | 29711 | 36 |
| 2008 | 31997 | 36 |
| 2007 | 28827 | 39 |
| 2006 | 24801 | 41 |
| 2005 | 22552 | 42 |
| 2004 | 21955 | 41 |
| 2003 | 18478 | 43 |
| 2002 | 14110 | 44 |
| 2001 | 12538 | 44 |
| 2000 | 12043 | 46 |
| 1999 | 13245 | 45 |
| 1998 | 13472 | 42 |
| 1997 | 13428 | 41 |
| 1996 | 13749 | 40 |
| 1995 | 12959 | 40 |
| 1994 | 11091 | 39 |
| 1993 | 10402 | 39 |
| 1992 | 11176 | 38 |
| 1991 | 10188 | 38 |
| 1990 | 9600 | 38 |
| 1989 | 7847 | 41 |
| 1988 | 7598 | 39 |
| 1987 | 6565 | 41 |
| 1986 | 5657 | 42 |