| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 23.35 | 90 |
| 2015 | 23.64 | 100 |
| 2014 | 23.26 | 105 |
| 2013 | 23.29 | 113 |
| 2012 | 24.01 | 106 |
| 2011 | 24.97 | 102 |
| 2010 | 26.01 | 98 |
| 2009 | 27.23 | 84 |
| 2008 | 28.96 | 79 |
| 2007 | 29.41 | 79 |
| 2006 | 30.3 | 68 |
| 2005 | 30.43 | 62 |
| 2004 | 30.08 | 69 |
| 2003 | 30.32 | 64 |
| 2002 | 30.49 | 67 |
| 2001 | 30.64 | 66 |
| 2000 | 30.74 | 65 |
| 1999 | 30.72 | 59 |
| 1998 | 30.52 | 63 |
| 1997 | 30.55 | 66 |
| 1996 | 30.45 | 67 |
| 1995 | 30.67 | 71 |