| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 50 | 86 |
| 2015 | 56 | 86 |
| 2014 | 63 | 86 |
| 2013 | 68 | 84 |
| 2012 | 73 | 81 |
| 2011 | 87 | 76 |
| 2010 | 85 | 74 |
| 2009 | 64 | 86 |
| 2008 | 58 | 89 |
| 2007 | 54 | 84 |
| 2006 | 52 | 81 |
| 2005 | 54 | 74 |
| 2004 | 39 | 77 |
| 2003 | 29 | 83 |
| 2002 | 17 | 96 |
| 2001 | 18 | 91 |
| 2000 | 23 | 82 |
| 1999 | 25 | 77 |
| 1998 | 25 | 82 |
| 1997 | 26 | 81 |
| 1996 | 27 | 76 |
| 1995 | 30 | 73 |
| 1994 | 27 | 68 |
| 1993 | 26 | 71 |
| 1992 | 23 | 70 |
| 1991 | 18 | 75 |
| 1990 | 17 | 76 |
| 1989 | 10 | 86 |
| 1988 | 11 | 88 |
| 1987 | 11 | 83 |
| 1986 | 10 | 80 |