| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 49928 | 12 |
| 2015 | 56554 | 7 |
| 2014 | 62215 | 9 |
| 2013 | 67792 | 9 |
| 2012 | 67678 | 9 |
| 2011 | 62245 | 10 |
| 2010 | 51874 | 12 |
| 2009 | 42743 | 19 |
| 2008 | 49665 | 19 |
| 2007 | 40992 | 29 |
| 2006 | 36118 | 30 |
| 2005 | 34017 | 30 |
| 2004 | 30472 | 30 |
| 2003 | 23465 | 33 |
| 2002 | 20082 | 36 |
| 2001 | 19518 | 34 |
| 2000 | 21691 | 28 |
| 1999 | 20561 | 30 |
| 1998 | 21366 | 26 |
| 1997 | 23551 | 22 |
| 1996 | 21944 | 24 |
| 1995 | 20385 | 25 |
| 1994 | 18102 | 25 |
| 1993 | 17681 | 25 |
| 1992 | 18616 | 24 |
| 1991 | 18865 | 23 |
| 1990 | 18249 | 24 |
| 1989 | 17838 | 15 |
| 1988 | 14283 | 24 |
| 1987 | 11644 | 27 |
| 1986 | 11380 | 22 |