| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2016 | 10 | 119 |
| 2015 | 10 | 127 |
| 2014 | 10 | 134 |
| 2013 | 9 | 134 |
| 2012 | 7 | 139 |
| 2011 | 7 | 133 |
| 2010 | 6 | 136 |
| 2009 | 5 | 138 |
| 2008 | 4 | 147 |
| 2007 | 4 | 140 |
| 2006 | 4 | 139 |
| 2005 | 4 | 141 |
| 2004 | 3 | 146 |
| 2003 | 3 | 141 |
| 2002 | 4 | 128 |
| 2001 | 4 | 127 |
| 2000 | 4 | 127 |
| 1999 | 4 | 125 |
| 1998 | 4 | 122 |
| 1997 | 4 | 126 |
| 1996 | 3 | 131 |
| 1995 | 3 | 126 |
| 1994 | 2 | 130 |
| 1993 | 2 | 132 |
| 1992 | 4 | 113 |
| 1991 | 4 | 110 |
| 1990 | 3 | 111 |
| 1989 | 4 | 102 |
| 1988 | 5 | 102 |