| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 32 | 97 |
| 2015 | 32 | 104 |
| 2014 | 36 | 105 |
| 2013 | 37 | 104 |
| 2012 | 37 | 104 |
| 2009 | 33 | 101 |
| 2008 | 36 | 101 |
| 2006 | 25 | 101 |
| 2005 | 21 | 102 |
| 2004 | 23 | 96 |
| 2003 | 21 | 94 |
| 2002 | 13 | 105 |
| 2001 | 19 | 90 |
| 2000 | 14 | 101 |
| 1999 | 12 | 99 |
| 1998 | 10 | 103 |
| 1997 | 17 | 93 |
| 1996 | 16 | 88 |
| 1995 | 14 | 91 |
| 1994 | 13 | 90 |
| 1993 | 14 | 90 |
| 1992 | 18 | 77 |
| 1991 | 19 | 74 |
| 1990 | 20 | 74 |
| 1989 | 20 | 70 |
| 1988 | 22 | 66 |
| 1987 | 23 | 66 |
| 1986 | 23 | 60 |