| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2015 | 1399 | 6 |
| 2014 | 1542 | 7 |
| 2013 | 1583 | 7 |
| 2012 | 1750 | 6 |
| 2011 | 1690 | 7 |
| 2010 | 1446 | 7 |
| 2009 | 1493 | 7 |
| 2008 | 1671 | 5 |
| 2007 | 1644 | 3 |
| 2006 | 1513 | 4 |
| 2005 | 1542 | 3 |
| 2004 | 1563 | 4 |
| 2003 | 1443 | 3 |
| 2002 | 1316 | 3 |
| 2001 | 1273 | 3 |
| 2000 | 1315 | 3 |
| 1999 | 1168 | 3 |
| 1998 | 1243 | 3 |
| 1997 | 1431 | 2 |
| 1996 | 1987 | 1 |
| 1995 | 2293 | 1 |
| 1991 | 6348 | 1 |
| 1990 | 4275 | 1 |
| 1989 | 990 | 4 |
| 1988 | 836 | 6 |
| 1987 | 688 | 6 |
| 1986 | 706 | 4 |