| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2014 | 14 | 124 |
| 2013 | 14 | 124 |
| 2012 | 15 | 119 |
| 2011 | 9 | 131 |
| 2010 | 7 | 133 |
| 2009 | 7 | 133 |
| 2008 | 6 | 138 |
| 2007 | 6 | 130 |
| 2006 | 5 | 134 |
| 2005 | 5 | 136 |
| 2004 | 4 | 142 |
| 2003 | 3 | 144 |
| 2002 | 3 | 135 |
| 2001 | 4 | 125 |
| 2000 | 6 | 118 |
| 1999 | 7 | 111 |
| 1998 | 9 | 104 |
| 1997 | 15 | 98 |
| 1996 | 16 | 92 |
| 1995 | 11 | 100 |
| 1994 | 18 | 81 |
| 1993 | 15 | 87 |
| 1992 | 13 | 84 |
| 1991 | 12 | 88 |
| 1990 | 16 | 79 |
| 1989 | 13 | 81 |
| 1988 | 11 | 92 |
| 1987 | 11 | 87 |
| 1986 | 10 | 76 |