| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 24.32 | 83 |
| 2015 | 24.37 | 97 |
| 2014 | 25.58 | 96 |
| 2013 | 26.61 | 90 |
| 2012 | 26.89 | 88 |
| 2011 | 28.75 | 76 |
| 2010 | 28.13 | 80 |
| 2009 | 28.32 | 69 |
| 2008 | 31.09 | 63 |
| 2007 | 33.07 | 53 |
| 2006 | 32.33 | 60 |
| 2005 | 28.68 | 80 |
| 2004 | 26.42 | 94 |
| 1999 | 23.68 | 111 |
| 1998 | 24 | 109 |
| 1997 | 25.55 | 101 |
| 1996 | 25.89 | 98 |
| 1995 | 29.08 | 83 |
| 1994 | 32.38 | 50 |
| 1993 | 33.35 | 45 |
| 1992 | 40.86 | 24 |
| 1991 | 37.42 | 30 |
| 1990 | 33.11 | 48 |
| 1989 | 35.09 | 35 |
| 1988 | 33.22 | 42 |
| 1987 | 32.45 | 46 |
| 1986 | 31.34 | 43 |