| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 27.89 | 25 |
| 2015 | 27.73 | 42 |
| 2014 | 26.97 | 47 |
| 2013 | 26.59 | 59 |
| 2012 | 26.54 | 57 |
| 2011 | 26.19 | 57 |
| 2010 | 25.89 | 56 |
| 2009 | 27.58 | 46 |
| 2008 | 29.88 | 46 |
| 2007 | 31.26 | 43 |
| 2006 | 30.11 | 42 |
| 2005 | 29.17 | 42 |
| 2004 | 28.34 | 40 |
| 2003 | 29.07 | 38 |
| 2002 | 29.36 | 38 |
| 2001 | 27.12 | 39 |
| 2000 | 30.08 | 31 |
| 1999 | 28.09 | 35 |
| 1998 | 22.12 | 53 |
| 1997 | 18.65 | 61 |
| 1996 | 16.07 | 70 |
| 1995 | 19.44 | 58 |