| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 34.8 | 105 |
| 2015 | 35.18 | 102 |
| 2014 | 34.82 | 101 |
| 2013 | 33.42 | 110 |
| 2012 | 33.07 | 112 |
| 2011 | 33.16 | 112 |
| 2010 | 33.12 | 116 |
| 2009 | 33.07 | 118 |
| 2008 | 33.01 | 124 |
| 2007 | 32.95 | 126 |
| 2006 | 32.89 | 127 |
| 2005 | 32.82 | 123 |
| 2004 | 32.75 | 127 |
| 2003 | 32.53 | 129 |
| 2002 | 32.31 | 129 |
| 2001 | 32.1 | 134 |
| 2000 | 31.89 | 135 |
| 1999 | 32.06 | 137 |
| 1998 | 32.19 | 141 |
| 1997 | 32.28 | 143 |
| 1996 | 30.85 | 144 |
| 1995 | 30.94 | 146 |
| 1994 | 30.75 | 148 |
| 1993 | 30.56 | 148 |
| 1992 | 30.39 | 153 |
| 1991 | 30.33 | 153 |