| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 26.23 | 45 |
| 2015 | 27.14 | 48 |
| 2014 | 26.83 | 45 |
| 2013 | 26.53 | 45 |
| 2012 | 26.35 | 45 |
| 2011 | 26.26 | 44 |
| 2010 | 26.17 | 44 |
| 2009 | 27.39 | 47 |
| 2008 | 28.83 | 50 |
| 2007 | 30.61 | 57 |
| 2006 | 32.85 | 60 |
| 2005 | 35.64 | 63 |
| 2004 | 36.96 | 66 |
| 2003 | 38.49 | 68 |
| 2002 | 40.3 | 70 |
| 2001 | 42.41 | 70 |
| 2000 | 44.72 | 72 |
| 1999 | 44.3 | 70 |
| 1998 | 44.09 | 70 |
| 1997 | 44.21 | 67 |
| 1996 | 44.61 | 66 |
| 1995 | 44.91 | 64 |
| 1994 | 46.08 | 65 |
| 1993 | 47.41 | 68 |
| 1992 | 48.67 | 68 |
| 1991 | 49.66 | 68 |
| 1990 | 50.19 | 68 |
| 1989 | 51 | 68 |
| 1988 | 51.58 | 69 |
| 1987 | 52.09 | 68 |
| 1986 | 52.51 | 68 |