| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 63 | 74 |
| 2015 | 60 | 83 |
| 2014 | 51 | 94 |
| 2013 | 46 | 96 |
| 2012 | 45 | 96 |
| 2011 | 43 | 96 |
| 2010 | 42 | 96 |
| 2009 | 42 | 95 |
| 2008 | 41 | 99 |
| 2007 | 33 | 99 |
| 2006 | 26 | 100 |
| 2005 | 25 | 99 |
| 2004 | 29 | 92 |
| 2003 | 22 | 93 |
| 2002 | 22 | 89 |
| 2001 | 19 | 89 |
| 2000 | 17 | 94 |
| 1996 | 7 | 117 |
| 1995 | 7 | 111 |
| 1994 | 7 | 107 |
| 1993 | 6 | 117 |
| 1992 | 5 | 110 |
| 1991 | 3 | 113 |
| 1990 | 5 | 106 |
| 1989 | 8 | 91 |
| 1988 | 15 | 74 |
| 1987 | 14 | 75 |
| 1986 | 36 | 48 |