| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 36.31 | 94 |
| 2015 | 36.77 | 93 |
| 2014 | 37.23 | 92 |
| 2013 | 37.34 | 91 |
| 2012 | 37.36 | 89 |
| 2011 | 35.08 | 102 |
| 2010 | 33.97 | 108 |
| 2009 | 32.85 | 119 |
| 2008 | 35.38 | 114 |
| 2007 | 34.99 | 115 |
| 2006 | 34.57 | 118 |
| 2005 | 33.1 | 122 |
| 2004 | 35.13 | 112 |
| 2003 | 35.28 | 111 |
| 2002 | 35.39 | 111 |
| 2001 | 35.72 | 115 |
| 2000 | 31.3 | 138 |
| 1999 | 32.99 | 130 |
| 1998 | 34.39 | 129 |
| 1997 | 34.07 | 135 |
| 1996 | 33.79 | 137 |
| 1995 | 33.87 | 139 |
| 1994 | 32.2 | 141 |
| 1993 | 32.04 | 145 |
| 1992 | 31.9 | 146 |
| 1991 | 31.79 | 148 |