| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.683 | 77 |
| 2015 | 2.683 | 100 |
| 2014 | 2.721 | 104 |
| 2013 | 4.097 | 78 |
| 2012 | 5.95 | 53 |
| 2011 | 7.223 | 37 |
| 2010 | 6.866 | 51 |
| 2009 | -.284 | 110 |
| 2008 | 4.278 | 89 |
| 2007 | 7.543 | 72 |
| 2006 | 7.538 | 57 |
| 2005 | 7.876 | 47 |
| 2004 | 9.055 | 35 |
| 2003 | 5.912 | 51 |
| 2002 | 5.548 | 54 |
| 2001 | 4.713 | 66 |
| 2000 | 6.053 | 44 |
| 1999 | -1.268 | 140 |
| 1998 | 4.188 | 74 |
| 1997 | 7.291 | 37 |
| 1996 | 7.631 | 24 |
| 1995 | 10.334 | 10 |
| 1994 | 5.244 | 41 |
| 1993 | 5.757 | 38 |
| 1992 | 12.377 | 7 |
| 1991 | 8.903 | 11 |
| 1990 | 3.623 | 59 |
| 1989 | 10.343 | 13 |
| 1988 | 5.056 | 41 |
| 1987 | 6.451 | 32 |
| 1986 | 4.791 | 38 |