| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 19 | 104 |
| 2015 | 16 | 120 |
| 2014 | 29 | 108 |
| 2013 | 55 | 92 |
| 2011 | 50 | 92 |
| 2010 | 52 | 92 |
| 2009 | 64 | 85 |
| 2008 | 55 | 91 |
| 2007 | 36 | 97 |
| 2006 | 21 | 104 |
| 2005 | 6 | 129 |
| 2004 | 5 | 131 |
| 2003 | 4 | 134 |
| 2002 | 4 | 133 |
| 2001 | 3 | 131 |
| 2000 | 3 | 129 |
| 1999 | 3 | 131 |
| 1998 | 2 | 132 |
| 1997 | 2 | 138 |
| 1996 | 3 | 130 |
| 1995 | 3 | 127 |
| 1994 | 3 | 122 |
| 1993 | 6 | 116 |
| 1992 | 6 | 107 |
| 1990 | 6 | 103 |
| 1989 | 10 | 88 |
| 1988 | 14 | 79 |
| 1987 | 6 | 94 |
| 1986 | 9 | 84 |