| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 18 | 106 |
| 2015 | 20 | 111 |
| 2014 | 22 | 114 |
| 2013 | 23 | 113 |
| 2012 | 25 | 109 |
| 2011 | 28 | 106 |
| 2010 | 35 | 101 |
| 2009 | 23 | 108 |
| 2008 | 14 | 120 |
| 2007 | 20 | 111 |
| 2006 | 18 | 107 |
| 2005 | 17 | 105 |
| 2004 | 16 | 105 |
| 2003 | 14 | 105 |
| 2002 | 10 | 107 |
| 2001 | 12 | 103 |
| 2000 | 16 | 96 |
| 1999 | 18 | 89 |
| 1998 | 15 | 93 |
| 1997 | 16 | 96 |
| 1996 | 16 | 91 |
| 1995 | 20 | 80 |
| 1994 | 15 | 85 |
| 1993 | 13 | 93 |
| 1992 | 15 | 81 |
| 1991 | 14 | 82 |
| 1990 | 15 | 84 |
| 1989 | 14 | 79 |
| 1988 | 11 | 90 |
| 1987 | 12 | 81 |
| 1986 | 9 | 82 |