| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 34 | 95 |
| 2015 | 39 | 98 |
| 2014 | 43 | 99 |
| 2013 | 41 | 101 |
| 2012 | 38 | 102 |
| 2011 | 38 | 100 |
| 2010 | 34 | 102 |
| 2009 | 28 | 106 |
| 2008 | 28 | 106 |
| 2007 | 22 | 108 |
| 2006 | 17 | 109 |
| 2005 | 15 | 107 |
| 2004 | 12 | 111 |
| 2003 | 11 | 112 |
| 2002 | 9 | 112 |
| 2001 | 7 | 113 |
| 2000 | 8 | 110 |
| 1999 | 7 | 114 |
| 1998 | 9 | 105 |
| 1997 | 12 | 102 |
| 1996 | 12 | 101 |
| 1995 | 13 | 95 |
| 1994 | 10 | 96 |
| 1993 | 7 | 107 |
| 1992 | 8 | 100 |