| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 42 | 90 |
| 2015 | 39 | 100 |
| 2014 | 39 | 102 |
| 2013 | 36 | 106 |
| 2012 | 37 | 103 |
| 2011 | 39 | 99 |
| 2010 | 38 | 98 |
| 2009 | 33 | 103 |
| 2008 | 26 | 107 |
| 2007 | 25 | 103 |
| 2006 | 21 | 103 |
| 2005 | 20 | 103 |
| 2004 | 18 | 102 |
| 2003 | 15 | 102 |
| 2002 | 14 | 102 |
| 2001 | 13 | 102 |
| 2000 | 13 | 102 |
| 1999 | 13 | 98 |
| 1998 | 12 | 98 |
| 1997 | 11 | 105 |
| 1996 | 10 | 107 |
| 1995 | 10 | 105 |
| 1994 | 9 | 101 |
| 1993 | 9 | 103 |
| 1992 | 9 | 96 |
| 1991 | 9 | 97 |
| 1990 | 12 | 91 |
| 1989 | 12 | 82 |
| 1988 | 13 | 83 |
| 1987 | 13 | 78 |
| 1986 | 12 | 71 |