| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 38 | 92 |
| 2015 | 33 | 103 |
| 2014 | 31 | 107 |
| 2013 | 34 | 107 |
| 2012 | 30 | 106 |
| 2011 | 28 | 105 |
| 2010 | 26 | 107 |
| 2009 | 23 | 109 |
| 2008 | 25 | 110 |
| 2007 | 23 | 105 |
| 2006 | 18 | 106 |
| 2005 | 16 | 106 |
| 2004 | 15 | 107 |
| 2003 | 16 | 101 |
| 2002 | 15 | 100 |
| 2001 | 14 | 101 |
| 2000 | 17 | 93 |
| 1999 | 18 | 90 |
| 1998 | 16 | 91 |
| 1997 | 22 | 87 |
| 1996 | 26 | 77 |
| 1995 | 24 | 76 |
| 1994 | 20 | 79 |
| 1993 | 18 | 82 |
| 1992 | 17 | 78 |
| 1991 | 14 | 81 |
| 1990 | 15 | 83 |
| 1989 | 16 | 75 |
| 1988 | 16 | 72 |
| 1987 | 11 | 86 |
| 1986 | 11 | 73 |