| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 18016 | 21 |
| 2015 | 18148 | 28 |
| 2014 | 17558 | 28 |
| 2013 | 17375 | 28 |
| 2012 | 17087 | 28 |
| 2011 | 16880 | 29 |
| 2010 | 16544 | 32 |
| 2009 | 15902 | 30 |
| 2008 | 16577 | 31 |
| 2007 | 16893 | 31 |
| 2006 | 16591 | 30 |
| 2005 | 16580 | 29 |
| 2004 | 16414 | 29 |
| 2003 | 15827 | 29 |
| 2002 | 15482 | 28 |
| 2001 | 14888 | 28 |
| 2000 | 14340 | 27 |
| 1999 | 12723 | 28 |
| 1998 | 11758 | 30 |
| 1997 | 12542 | 27 |
| 1996 | 12249 | 27 |
| 1995 | 11990 | 27 |
| 1994 | 11923 | 25 |
| 1993 | 11443 | 25 |
| 1992 | 10516 | 27 |
| 1991 | 10245 | 27 |
| 1990 | 9933 | 27 |
| 1989 | 9611 | 25 |
| 1988 | 9135 | 25 |
| 1987 | 8395 | 27 |
| 1986 | 7736 | 28 |