| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 23 | 99 |
| 2015 | 25 | 108 |
| 2014 | 18 | 118 |
| 2013 | 16 | 122 |
| 2012 | 15 | 121 |
| 2011 | 13 | 121 |
| 2010 | 12 | 121 |
| 2009 | 10 | 120 |
| 2008 | 6 | 139 |
| 2007 | 6 | 132 |
| 2006 | 6 | 131 |
| 2005 | 5 | 134 |
| 2004 | 5 | 129 |
| 2003 | 5 | 132 |
| 2002 | 5 | 124 |
| 2001 | 6 | 116 |
| 2000 | 7 | 112 |
| 1999 | 7 | 113 |
| 1998 | 7 | 112 |
| 1997 | 9 | 110 |
| 1996 | 10 | 106 |
| 1995 | 12 | 97 |
| 1994 | 10 | 95 |
| 1993 | 4 | 125 |