| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 52 | 80 |
| 2015 | 51 | 90 |
| 2014 | 46 | 97 |
| 2013 | 44 | 99 |
| 2012 | 44 | 97 |
| 2011 | 40 | 98 |
| 2010 | 36 | 99 |
| 2009 | 33 | 102 |
| 2008 | 36 | 100 |
| 2007 | 33 | 98 |
| 2006 | 32 | 97 |
| 2005 | 30 | 96 |
| 2004 | 28 | 94 |
| 2003 | 25 | 90 |
| 2002 | 22 | 88 |
| 2001 | 21 | 88 |
| 2000 | 22 | 86 |
| 1999 | 24 | 79 |
| 1998 | 25 | 81 |
| 1997 | 27 | 79 |
| 1996 | 30 | 73 |
| 1995 | 31 | 71 |
| 1994 | 28 | 67 |
| 1993 | 31 | 68 |
| 1992 | 30 | 64 |
| 1991 | 29 | 65 |
| 1990 | 26 | 69 |
| 1989 | 26 | 64 |
| 1988 | 28 | 63 |
| 1987 | 26 | 63 |
| 1986 | 25 | 56 |