| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 28.65 | 131 |
| 2015 | 27.75 | 136 |
| 2014 | 27.52 | 134 |
| 2013 | 25.79 | 137 |
| 2012 | 28.26 | 133 |
| 2011 | 27.38 | 135 |
| 2010 | 25.35 | 142 |
| 2009 | 22.75 | 160 |
| 2008 | 22.95 | 164 |
| 2007 | 23.75 | 161 |
| 2006 | 23.53 | 161 |
| 2005 | 23.3 | 164 |
| 2004 | 22.14 | 167 |
| 2003 | 27.61 | 146 |
| 2002 | 23.37 | 166 |
| 2001 | 28.38 | 146 |
| 2000 | 28.38 | 151 |
| 1999 | 27.83 | 154 |
| 1998 | 25.09 | 164 |
| 1997 | 25.81 | 159 |
| 1996 | 25.99 | 160 |
| 1995 | 28.11 | 152 |
| 1994 | 26.11 | 161 |
| 1993 | 27.1 | 158 |
| 1992 | 26.96 | 160 |
| 1991 | 24.67 | 167 |