| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2015 | 41385 | 1 |
| 2014 | 41423 | 1 |
| 2013 | 41428 | 1 |
| 2012 | 41004 | 1 |
| 2011 | 40390 | 1 |
| 2010 | 40511 | 2 |
| 2009 | 40277 | 1 |
| 2008 | 40278 | 1 |
| 2007 | 40185 | 1 |
| 2006 | 39621 | 1 |
| 2005 | 39289 | 1 |
| 2004 | 38965 | 1 |
| 2003 | 38535 | 1 |
| 2002 | 38657 | 2 |
| 2001 | 38822 | 2 |
| 2000 | 38253 | 1 |
| 1999 | 37800 | 1 |
| 1998 | 37228 | 1 |
| 1997 | 36548 | 1 |
| 1996 | 36052 | 1 |
| 1995 | 35824 | 1 |
| 1994 | 35748 | 1 |
| 1993 | 35600 | 1 |
| 1992 | 36060 | 1 |
| 1991 | 36290 | 1 |
| 1990 | 36089 | 1 |
| 1989 | 35896 | 1 |
| 1988 | 35295 | 1 |
| 1987 | 34812 | 1 |
| 1986 | 34013 | 1 |