| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 31 | 98 |
| 2015 | 30 | 106 |
| 2014 | 27 | 110 |
| 2013 | 33 | 108 |
| 2012 | 26 | 108 |
| 2011 | 24 | 108 |
| 2010 | 19 | 113 |
| 2009 | 14 | 116 |
| 2008 | 14 | 119 |
| 2007 | 14 | 117 |
| 2006 | 11 | 119 |
| 2005 | 9 | 117 |
| 2004 | 11 | 113 |
| 2003 | 10 | 116 |
| 2002 | 6 | 120 |
| 2001 | 4 | 130 |
| 2000 | 5 | 123 |
| 1999 | 5 | 119 |
| 1998 | 5 | 120 |
| 1997 | 16 | 95 |
| 1996 | 14 | 94 |
| 1995 | 13 | 96 |
| 1994 | 12 | 92 |
| 1993 | 10 | 101 |
| 1992 | 10 | 95 |
| 1991 | 9 | 96 |
| 1990 | 9 | 96 |
| 1989 | 8 | 89 |
| 1988 | 8 | 94 |
| 1987 | 8 | 92 |
| 1986 | 10 | 79 |