| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 13.6 | 31 |
| 2015 | 11.625 | 52 |
| 2014 | 11.708 | 51 |
| 2013 | 12.292 | 50 |
| 2012 | 12 | 55 |
| 2011 | 11.033 | 60 |
| 2010 | 11.008 | 63 |
| 2009 | 11.975 | 65 |
| 2008 | 12.325 | 70 |
| 2007 | 12.508 | 71 |
| 2006 | 12.6 | 65 |
| 2005 | 13.142 | 60 |
| 2004 | 13.375 | 61 |
| 2003 | 13.533 | 71 |
| 2002 | 13.792 | 72 |
| 2001 | 13.292 | 75 |
| 2000 | 13.216 | 79 |
| 1999 | 12.965 | 88 |
| 1998 | 13.017 | 90 |
| 1997 | 13.792 | 85 |
| 1996 | 15.583 | 76 |
| 1995 | 16.471 | 61 |
| 1994 | 16.513 | 54 |
| 1993 | 18.298 | 43 |
| 1992 | 20.328 | 34 |
| 1990 | 19 | 31 |
| 1989 | 18.333 | 31 |
| 1988 | 17 | 25 |
| 1987 | 16.333 | 25 |
| 1986 | 15 | 31 |