| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 20 | 101 |
| 2015 | 18 | 112 |
| 2014 | 15 | 123 |
| 2013 | 13 | 127 |
| 2012 | 12 | 128 |
| 2011 | 12 | 122 |
| 2010 | 11 | 124 |
| 2009 | 8 | 128 |
| 2008 | 7 | 133 |
| 2007 | 6 | 131 |
| 2006 | 6 | 127 |
| 2005 | 6 | 131 |
| 2004 | 6 | 126 |
| 2003 | 5 | 126 |
| 2002 | 5 | 125 |
| 2001 | 5 | 119 |
| 2000 | 6 | 116 |
| 1999 | 6 | 117 |
| 1998 | 6 | 116 |
| 1997 | 6 | 120 |
| 1996 | 5 | 119 |
| 1995 | 5 | 120 |
| 1994 | 5 | 116 |
| 1993 | 4 | 126 |
| 1992 | 4 | 115 |
| 1991 | 4 | 108 |
| 1990 | 4 | 108 |
| 1989 | 4 | 104 |
| 1988 | 3 | 105 |
| 1987 | 3 | 102 |
| 1986 | 3 | 96 |