| 时间 | 值 （美元） | 世界排名 |
|---|---|---|
| 2016 | 59331 | 7 |
| 2015 | 66347 | 5 |
| 2014 | 86853 | 6 |
| 2013 | 88305 | 5 |
| 2012 | 88565 | 4 |
| 2011 | 85948 | 7 |
| 2010 | 70306 | 7 |
| 2009 | 61478 | 8 |
| 2008 | 82967 | 6 |
| 2007 | 67006 | 9 |
| 2006 | 60257 | 8 |
| 2005 | 51488 | 9 |
| 2004 | 41818 | 14 |
| 2003 | 34177 | 16 |
| 2002 | 29991 | 16 |
| 2001 | 28431 | 14 |
| 2000 | 29986 | 13 |
| 1999 | 21763 | 29 |
| 1998 | 18632 | 33 |
| 1997 | 21133 | 26 |
| 1996 | 17345 | 35 |
| 1995 | 15849 | 36 |
| 1994 | 14543 | 33 |
| 1993 | 14268 | 33 |
| 1992 | 15431 | 32 |
| 1991 | 14120 | 31 |
| 1990 | 15449 | 26 |
| 1989 | 14047 | 25 |
| 1988 | 13606 | 27 |
| 1987 | 12896 | 24 |
| 1986 | 12698 | 20 |