| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 59 | 76 |
| 2015 | 61 | 81 |
| 2014 | 56 | 91 |
| 2013 | 52 | 94 |
| 2012 | 52 | 91 |
| 2011 | 53 | 91 |
| 2010 | 53 | 91 |
| 2009 | 49 | 94 |
| 2008 | 46 | 96 |
| 2007 | 41 | 96 |
| 2006 | 38 | 93 |
| 2005 | 33 | 93 |
| 2004 | 32 | 88 |
| 2003 | 37 | 77 |
| 2002 | 42 | 68 |
| 2001 | 43 | 67 |
| 2000 | 38 | 68 |
| 1999 | 36 | 70 |
| 1998 | 35 | 73 |
| 1997 | 34 | 74 |
| 1996 | 33 | 71 |
| 1995 | 31 | 72 |
| 1994 | 28 | 66 |
| 1993 | 25 | 75 |
| 1992 | 24 | 69 |
| 1991 | 24 | 69 |
| 1990 | 27 | 67 |
| 1989 | 28 | 62 |
| 1988 | 32 | 60 |
| 1987 | 50 | 48 |
| 1986 | 60 | 40 |