| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 30.72 | 126 |
| 2015 | 30.96 | 119 |
| 2014 | 30.49 | 120 |
| 2013 | 30.84 | 120 |
| 2012 | 31.37 | 122 |
| 2011 | 32.09 | 118 |
| 2010 | 31.25 | 124 |
| 2009 | 26.2 | 145 |
| 2008 | 28.15 | 139 |
| 2007 | 27.16 | 144 |
| 2006 | 26.3 | 146 |
| 2005 | 25.48 | 152 |
| 2004 | 24.92 | 156 |
| 2003 | 24.52 | 160 |
| 2002 | 24.62 | 163 |
| 2001 | 25.52 | 161 |
| 2000 | 26.57 | 158 |
| 1999 | 27.75 | 155 |
| 1998 | 30.77 | 145 |
| 1997 | 31.91 | 145 |
| 1996 | 32.11 | 142 |
| 1995 | 34.87 | 136 |
| 1994 | 36.18 | 128 |
| 1993 | 37.35 | 121 |
| 1992 | 35.71 | 133 |
| 1991 | 34.29 | 138 |