| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 19 | 103 |
| 2015 | 18 | 115 |
| 2014 | 18 | 117 |
| 2013 | 19 | 116 |
| 2012 | 19 | 115 |
| 2011 | 15 | 116 |
| 2010 | 15 | 118 |
| 2009 | 14 | 118 |
| 2008 | 15 | 118 |
| 2007 | 13 | 118 |
| 2006 | 10 | 120 |
| 2005 | 9 | 120 |
| 2004 | 7 | 123 |
| 2003 | 7 | 120 |
| 2002 | 6 | 119 |
| 2001 | 6 | 117 |
| 2000 | 5 | 121 |
| 1999 | 5 | 118 |
| 1998 | 6 | 117 |
| 1997 | 6 | 117 |
| 1996 | 6 | 118 |
| 1995 | 5 | 119 |
| 1994 | 4 | 119 |
| 1993 | 4 | 121 |
| 1992 | 6 | 106 |
| 1991 | 8 | 99 |
| 1990 | 11 | 92 |
| 1989 | 10 | 87 |
| 1988 | 11 | 87 |
| 1987 | 12 | 80 |
| 1986 | 9 | 86 |