| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 27.85 | 138 |
| 2015 | 27.49 | 138 |
| 2014 | 27.77 | 132 |
| 2013 | 28.04 | 132 |
| 2012 | 28.27 | 132 |
| 2011 | 29.45 | 133 |
| 2010 | 29.96 | 129 |
| 2009 | 30.4 | 129 |
| 2008 | 31.45 | 132 |
| 2007 | 31.19 | 134 |
| 2006 | 29.81 | 138 |
| 2005 | 30.02 | 136 |
| 2004 | 28.98 | 138 |
| 2003 | 29.96 | 138 |
| 2002 | 29.05 | 144 |
| 2001 | 28.83 | 144 |
| 2000 | 28.32 | 152 |
| 1999 | 26.57 | 159 |
| 1998 | 25.56 | 160 |
| 1997 | 24.88 | 164 |
| 1996 | 25.97 | 161 |
| 1995 | 26.4 | 159 |
| 1994 | 26.44 | 157 |
| 1993 | 28.82 | 154 |
| 1992 | 31.55 | 149 |
| 1991 | 32.79 | 145 |