| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 16 | 111 |
| 2015 | 14 | 122 |
| 2014 | 17 | 119 |
| 2013 | 17 | 119 |
| 2012 | 14 | 122 |
| 2011 | 17 | 114 |
| 2010 | 15 | 117 |
| 2009 | 17 | 113 |
| 2008 | 18 | 116 |
| 2007 | 16 | 116 |
| 2006 | 13 | 117 |
| 2005 | 11 | 115 |
| 2004 | 10 | 115 |
| 2003 | 9 | 119 |
| 2002 | 7 | 116 |
| 2001 | 7 | 114 |
| 2000 | 6 | 119 |
| 1999 | 8 | 108 |
| 1998 | 8 | 109 |
| 1997 | 8 | 115 |
| 1996 | 9 | 109 |
| 1995 | 9 | 107 |
| 1994 | 8 | 104 |
| 1993 | 14 | 91 |
| 1992 | 14 | 82 |
| 1991 | 14 | 83 |
| 1990 | 16 | 81 |
| 1989 | 14 | 78 |
| 1988 | 15 | 77 |
| 1987 | 14 | 73 |
| 1986 | 13 | 69 |