| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 9.683 | 54 |
| 2015 | 10.008 | 61 |
| 2014 | 10.25 | 65 |
| 2013 | 10.292 | 64 |
| 2012 | 10.604 | 68 |
| 2011 | 10.167 | 73 |
| 2010 | 8.333 | 98 |
| 2009 | 12.188 | 62 |
| 2008 | 13.313 | 58 |
| 2007 | 13.021 | 63 |
| 2006 | 11.188 | 75 |
| 2005 | 10.75 | 81 |
| 2004 | 10.917 | 85 |
| 2003 | 11.458 | 87 |
| 2002 | 11.917 | 86 |
| 2001 | 12.083 | 86 |
| 2000 | 12.292 | 85 |
| 1999 | 12.542 | 92 |
| 1998 | 13.542 | 88 |
| 1997 | 13.833 | 84 |
| 1996 | 15.958 | 74 |
| 1995 | 15.458 | 74 |
| 1994 | 14.75 | 67 |
| 1993 | 16.25 | 56 |
| 1992 | 18.917 | 40 |
| 1991 | 17.875 | 45 |
| 1990 | 16.5 | 39 |
| 1989 | 16.5 | 36 |
| 1988 | 16.5 | 27 |
| 1987 | 16.5 | 23 |
| 1986 | 16.5 | 22 |