| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 26.71 | 73 |
| 2015 | 27.44 | 80 |
| 2014 | 28.63 | 68 |
| 2013 | 28.77 | 70 |
| 2012 | 28.75 | 73 |
| 2011 | 29.19 | 72 |
| 2010 | 27.97 | 84 |
| 2009 | 26.94 | 89 |
| 2008 | 29.5 | 70 |
| 2007 | 30.83 | 66 |
| 2006 | 30.64 | 65 |
| 2005 | 29.78 | 68 |
| 2004 | 28.83 | 78 |
| 2003 | 29.28 | 71 |
| 2002 | 28.73 | 76 |
| 2001 | 28.45 | 78 |
| 2000 | 27.8 | 85 |
| 1999 | 26.58 | 90 |
| 1998 | 28.58 | 75 |
| 1997 | 30.3 | 68 |
| 1996 | 30.41 | 68 |
| 1995 | 31.89 | 63 |