| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 13.12 | 52 |
| 2015 | 12.83 | 52 |
| 2014 | 12.53 | 51 |
| 2013 | 12.23 | 51 |
| 2012 | 11.94 | 50 |
| 2011 | 11.67 | 51 |
| 2010 | 11.42 | 51 |
| 2009 | 11.24 | 51 |
| 2008 | 11.11 | 52 |
| 2007 | 10.99 | 52 |
| 2006 | 10.88 | 52 |
| 2005 | 10.77 | 51 |
| 2004 | 10.61 | 52 |
| 2003 | 10.47 | 52 |
| 2002 | 10.36 | 51 |
| 2001 | 10.28 | 50 |
| 2000 | 10.23 | 49 |
| 1999 | 10.18 | 48 |
| 1998 | 10.15 | 48 |
| 1997 | 10.12 | 47 |
| 1996 | 10.11 | 47 |
| 1995 | 10.12 | 45 |
| 1994 | 10.04 | 45 |
| 1993 | 9.98 | 45 |
| 1992 | 9.95 | 45 |
| 1991 | 9.93 | 43 |
| 1990 | 9.91 | 42 |
| 1989 | 9.88 | 41 |
| 1988 | 9.85 | 41 |
| 1987 | 9.84 | 39 |
| 1986 | 9.84 | 39 |