| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 16 | 112 |
| 2015 | 17 | 116 |
| 2014 | 17 | 120 |
| 2013 | 16 | 121 |
| 2012 | 15 | 117 |
| 2011 | 13 | 120 |
| 2010 | 12 | 120 |
| 2009 | 10 | 121 |
| 2008 | 12 | 122 |
| 2007 | 10 | 120 |
| 2006 | 10 | 121 |
| 2005 | 8 | 122 |
| 2004 | 9 | 118 |
| 2003 | 14 | 106 |
| 2002 | 13 | 104 |
| 2001 | 17 | 94 |
| 2000 | 14 | 100 |
| 1999 | 11 | 104 |
| 1998 | 13 | 96 |
| 1997 | 12 | 101 |
| 1996 | 13 | 97 |
| 1995 | 15 | 90 |
| 1994 | 15 | 87 |
| 1993 | 15 | 88 |
| 1992 | 16 | 80 |
| 1991 | 13 | 85 |
| 1990 | 14 | 87 |
| 1989 | 17 | 74 |
| 1988 | 17 | 71 |
| 1987 | 14 | 77 |
| 1986 | 14 | 65 |