| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 2 | 134 |
| 2015 | 3 | 143 |
| 2014 | 3 | 148 |
| 2013 | 4 | 146 |
| 2012 | 3 | 148 |
| 2011 | 3 | 141 |
| 2010 | 3 | 143 |
| 2009 | 4 | 143 |
| 2008 | 3 | 148 |
| 2007 | 2 | 144 |
| 2006 | 2 | 147 |
| 2005 | 3 | 146 |
| 2004 | 2 | 150 |
| 2003 | 1 | 151 |
| 2002 | 1 | 146 |
| 2001 | 1 | 143 |
| 2000 | 1 | 142 |
| 1999 | 1 | 137 |
| 1998 | 1 | 136 |
| 1997 | 3 | 134 |
| 1996 | 2 | 136 |
| 1995 | 1 | 137 |
| 1994 | 2 | 129 |
| 1993 | 3 | 130 |
| 1992 | 3 | 116 |
| 1991 | 2 | 115 |
| 1990 | 3 | 113 |
| 1989 | 3 | 106 |
| 1988 | 2 | 109 |
| 1987 | 3 | 105 |
| 1986 | 3 | 98 |