| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 18 | 108 |
| 2015 | 23 | 110 |
| 2014 | 28 | 109 |
| 2013 | 25 | 111 |
| 2012 | 24 | 111 |
| 2011 | 22 | 109 |
| 2010 | 20 | 111 |
| 2009 | 16 | 115 |
| 2008 | 21 | 113 |
| 2007 | 18 | 112 |
| 2006 | 17 | 110 |
| 2005 | 12 | 112 |
| 2004 | 8 | 119 |
| 1999 | 5 | 121 |
| 1997 | 4 | 125 |
| 1996 | 4 | 128 |
| 1995 | 6 | 114 |
| 1994 | 7 | 108 |
| 1993 | 6 | 113 |
| 1992 | 11 | 91 |
| 1991 | 10 | 93 |
| 1990 | 15 | 82 |
| 1989 | 21 | 68 |
| 1988 | 11 | 89 |
| 1987 | 9 | 90 |
| 1986 | 9 | 87 |