| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 16.82 | 28 |
| 2015 | 16.31 | 28 |
| 2014 | 15.87 | 29 |
| 2013 | 15.46 | 30 |
| 2012 | 15.09 | 29 |
| 2011 | 14.78 | 29 |
| 2010 | 14.54 | 29 |
| 2009 | 14.46 | 29 |
| 2008 | 14.48 | 29 |
| 2007 | 14.55 | 27 |
| 2006 | 14.6 | 27 |
| 2005 | 14.58 | 27 |
| 2004 | 14.5 | 27 |
| 2003 | 14.34 | 27 |
| 2002 | 14.11 | 28 |
| 2001 | 13.84 | 28 |
| 2000 | 13.54 | 29 |
| 1999 | 13.18 | 30 |
| 1998 | 12.79 | 31 |
| 1997 | 12.37 | 32 |
| 1996 | 11.92 | 35 |
| 1995 | 11.44 | 37 |
| 1994 | 11.08 | 39 |
| 1993 | 10.7 | 39 |
| 1992 | 10.32 | 41 |
| 1991 | 9.95 | 42 |
| 1990 | 9.59 | 44 |