| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 10.458 | 48 |
| 2015 | 9.417 | 65 |
| 2014 | 9.125 | 75 |
| 2013 | 8.5 | 92 |
| 2012 | 8.75 | 90 |
| 2011 | 9 | 87 |
| 2010 | 9.833 | 79 |
| 2009 | 11.708 | 68 |
| 2008 | 15.125 | 42 |
| 2007 | 13.167 | 61 |
| 2006 | 11.167 | 78 |
| 2005 | 10.625 | 85 |
| 2004 | 11.292 | 81 |
| 2003 | 14.958 | 62 |
| 2002 | 15.75 | 59 |
| 2001 | 13.771 | 74 |
| 2000 | 14.5 | 76 |
| 1999 | 18 | 60 |
| 1998 | 21.792 | 48 |
| 1997 | 20 | 54 |
| 1996 | 19.521 | 60 |
| 1995 | 17.896 | 56 |
| 1994 | 15.583 | 61 |
| 1993 | 16.158 | 57 |
| 1992 | 18.906 | 41 |
| 1991 | 20.313 | 31 |
| 1990 | 21 | 27 |
| 1989 | 19.833 | 25 |
| 1988 | 15.333 | 32 |
| 1987 | 12.5 | 52 |
| 1986 | 14.333 | 39 |