| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 73187 | 3 |
| 2015 | 75573 | 3 |
| 2014 | 94004 | 4 |
| 2013 | 89525 | 4 |
| 2012 | 76496 | 8 |
| 2011 | 66813 | 9 |
| 2010 | 52375 | 10 |
| 2009 | 40881 | 23 |
| 2008 | 40668 | 29 |
| 2007 | 36403 | 32 |
| 2006 | 29980 | 36 |
| 2005 | 25059 | 39 |
| 2004 | 22453 | 39 |
| 2003 | 17810 | 44 |
| 2002 | 16313 | 43 |
| 2001 | 15548 | 39 |
| 2000 | 15703 | 39 |
| 1999 | 15505 | 38 |
| 1998 | 16451 | 36 |
| 1997 | 17958 | 30 |
| 1996 | 18097 | 33 |
| 1995 | 18139 | 30 |
| 1994 | 16578 | 28 |
| 1993 | 15190 | 30 |
| 1992 | 13461 | 34 |
| 1991 | 10558 | 37 |
| 1990 | 9365 | 39 |
| 1989 | 8060 | 39 |
| 1988 | 7072 | 41 |
| 1987 | 6297 | 42 |
| 1986 | 5132 | 43 |