| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 26939 | 28 |
| 2015 | 30968 | 29 |
| 2014 | 41591 | 27 |
| 2013 | 44597 | 24 |
| 2012 | 47651 | 21 |
| 2011 | 47017 | 24 |
| 2010 | 35268 | 32 |
| 2009 | 27965 | 38 |
| 2008 | 37951 | 34 |
| 2007 | 32672 | 36 |
| 2006 | 30981 | 35 |
| 2005 | 26102 | 38 |
| 2004 | 21897 | 42 |
| 2003 | 18556 | 42 |
| 2002 | 16846 | 42 |
| 2001 | 16468 | 38 |
| 2000 | 18008 | 37 |
| 1999 | 14098 | 43 |
| 1998 | 12691 | 44 |
| 1997 | 16656 | 36 |
| 1996 | 16789 | 36 |
| 1995 | 15929 | 35 |
| 1994 | 14117 | 34 |
| 1993 | 14572 | 32 |
| 1992 | 15270 | 33 |
| 1991 | 13902 | 33 |
| 1990 | 13604 | 32 |
| 1989 | 11870 | 32 |
| 1988 | 11007 | 31 |
| 1987 | 11592 | 28 |
| 1986 | 10212 | 28 |