| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 44177 | 14 |
| 2015 | 43665 | 15 |
| 2014 | 51323 | 16 |
| 2013 | 50505 | 18 |
| 2012 | 48334 | 20 |
| 2011 | 51127 | 17 |
| 2010 | 46657 | 18 |
| 2009 | 47654 | 12 |
| 2008 | 51386 | 17 |
| 2007 | 46587 | 21 |
| 2006 | 40431 | 25 |
| 2005 | 38242 | 22 |
| 2004 | 36693 | 20 |
| 2003 | 32103 | 21 |
| 2002 | 26351 | 22 |
| 2001 | 24490 | 21 |
| 2000 | 24517 | 20 |
| 1999 | 27117 | 17 |
| 1998 | 27290 | 16 |
| 1997 | 26647 | 15 |
| 1996 | 29742 | 13 |
| 1995 | 30253 | 10 |
| 1994 | 25585 | 12 |
| 1993 | 24024 | 13 |
| 1992 | 24820 | 14 |
| 1991 | 22357 | 15 |
| 1990 | 21629 | 16 |
| 1989 | 17427 | 18 |
| 1988 | 17536 | 17 |
| 1987 | 16353 | 16 |
| 1986 | 13052 | 18 |