| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 78813 | 2 |
| 2015 | 80990 | 2 |
| 2014 | 85815 | 7 |
| 2013 | 84659 | 7 |
| 2012 | 83164 | 6 |
| 2011 | 87998 | 5 |
| 2010 | 74277 | 6 |
| 2009 | 69672 | 6 |
| 2008 | 72120 | 8 |
| 2007 | 63223 | 10 |
| 2006 | 57349 | 9 |
| 2005 | 54798 | 8 |
| 2004 | 53256 | 7 |
| 2003 | 47961 | 7 |
| 2002 | 41337 | 7 |
| 2001 | 38539 | 7 |
| 2000 | 37813 | 8 |
| 1999 | 40577 | 6 |
| 1998 | 41488 | 5 |
| 1997 | 40430 | 5 |
| 1996 | 46610 | 4 |
| 1995 | 48541 | 4 |
| 1994 | 41739 | 4 |
| 1993 | 38005 | 4 |
| 1992 | 39436 | 4 |
| 1991 | 38303 | 3 |
| 1990 | 38332 | 3 |
| 1989 | 30326 | 3 |
| 1988 | 31664 | 3 |
| 1987 | 29485 | 3 |
| 1986 | 23692 | 3 |