| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2014 | 179479 | 1 |
| 2013 | 173528 | 1 |
| 2012 | 149296 | 1 |
| 2011 | 158283 | 2 |
| 2010 | 141165 | 2 |
| 2009 | 125945 | 2 |
| 2008 | 142974 | 2 |
| 2007 | 130267 | 2 |
| 2006 | 113983 | 2 |
| 2005 | 104994 | 2 |
| 2004 | 99849 | 2 |
| 2003 | 89470 | 2 |
| 2002 | 79036 | 2 |
| 2001 | 74005 | 2 |
| 2000 | 74625 | 2 |
| 1999 | 81116 | 2 |
| 1998 | 76641 | 2 |
| 1997 | 72191 | 2 |
| 1996 | 79937 | 2 |
| 1995 | 78762 | 2 |
| 1994 | 64157 | 2 |
| 1993 | 55921 | 2 |
| 1992 | 55300 | 2 |
| 1991 | 50988 | 2 |
| 1990 | 49447 | 2 |
| 1989 | 39427 | 2 |
| 1988 | 41351 | 2 |
| 1987 | 37869 | 2 |
| 1986 | 28316 | 2 |