| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 33.34 | 28 |
| 2015 | 34.12 | 33 |
| 2014 | 33.2 | 45 |
| 2013 | 32.24 | 52 |
| 2012 | 33.57 | 47 |
| 2011 | 33.95 | 47 |
| 2010 | 33.17 | 50 |
| 2009 | 33.52 | 46 |
| 2008 | 33.31 | 56 |
| 2007 | 33.19 | 52 |
| 2006 | 33.12 | 59 |
| 2005 | 32.8 | 52 |
| 2004 | 32.75 | 54 |
| 2003 | 31.24 | 54 |
| 2002 | 30.3 | 68 |
| 2001 | 30.91 | 63 |
| 2000 | 32.55 | 53 |
| 1999 | 33.93 | 38 |
| 1998 | 35.04 | 26 |
| 1997 | 35.23 | 29 |
| 1996 | 35.05 | 34 |
| 1995 | 36.4 | 31 |