| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 61606 | 5 |
| 2015 | 60664 | 6 |
| 2014 | 55503 | 12 |
| 2013 | 52035 | 16 |
| 2012 | 49231 | 17 |
| 2011 | 52568 | 15 |
| 2010 | 48539 | 14 |
| 2009 | 51984 | 10 |
| 2008 | 61235 | 11 |
| 2007 | 61388 | 11 |
| 2006 | 54326 | 11 |
| 2005 | 50887 | 10 |
| 2004 | 47631 | 8 |
| 2003 | 41107 | 8 |
| 2002 | 32539 | 10 |
| 2001 | 28224 | 15 |
| 2000 | 26242 | 17 |
| 1999 | 26308 | 19 |
| 1998 | 24271 | 22 |
| 1997 | 22540 | 23 |
| 1996 | 20856 | 27 |
| 1995 | 19177 | 26 |
| 1994 | 15919 | 31 |
| 1993 | 14672 | 31 |
| 1992 | 15730 | 31 |
| 1991 | 14101 | 32 |
| 1990 | 14045 | 29 |
| 1989 | 11187 | 34 |
| 1988 | 10726 | 32 |
| 1987 | 9591 | 32 |
| 1986 | 8120 | 32 |