| 时间 | 值 （美元/人） | 世界排名 |
|---|---|---|
| 2015 | 1042 | 9 |
| 2014 | 1104 | 11 |
| 2013 | 1024 | 10 |
| 2012 | 909 | 13 |
| 2011 | 809 | 14 |
| 2010 | 679 | 16 |
| 2009 | 699 | 17 |
| 2008 | 646 | 20 |
| 2007 | 620 | 18 |
| 2006 | 599 | 18 |
| 2005 | 577 | 19 |
| 2004 | 641 | 13 |
| 2003 | 663 | 13 |
| 2002 | 604 | 12 |
| 2001 | 534 | 12 |
| 2000 | 540 | 12 |
| 1999 | 572 | 13 |
| 1998 | 537 | 14 |
| 1997 | 541 | 14 |
| 1996 | 556 | 14 |
| 1995 | 538 | 14 |
| 1994 | 518 | 13 |
| 1993 | 521 | 11 |
| 1992 | 534 | 14 |
| 1991 | 517 | 16 |
| 1990 | 483 | 18 |
| 1989 | 453 | 14 |
| 1988 | 446 | 16 |