| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 11.93 | 53 |
| 2015 | 11.15 | 66 |
| 2014 | 11.06 | 69 |
| 2013 | 10.97 | 69 |
| 2012 | 11.11 | 68 |
| 2011 | 14.52 | 56 |
| 2010 | 13.99 | 55 |
| 2009 | 13.63 | 58 |
| 2008 | 13.22 | 61 |
| 2007 | 14.07 | 55 |
| 2006 | 14.07 | 62 |
| 2005 | 14.88 | 61 |
| 2004 | 15.18 | 61 |
| 2003 | 16.34 | 59 |
| 2002 | 16.46 | 55 |
| 2001 | 16.56 | 58 |
| 2000 | 16.74 | 62 |
| 1999 | 17.32 | 63 |
| 1998 | 17.11 | 66 |
| 1997 | 16.95 | 67 |
| 1996 | 17.26 | 68 |
| 1995 | 16.78 | 68 |
| 1994 | 16.87 | 67 |
| 1993 | 16.71 | 68 |
| 1992 | 16.54 | 65 |
| 1991 | 17.57 | 62 |
| 1990 | 19.37 | 60 |
| 1989 | 19.67 | 55 |
| 1988 | 18.96 | 55 |
| 1987 | 20.49 | 51 |
| 1986 | 20.79 | 48 |