| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 26.46 | 77 |
| 2015 | 26.56 | 88 |
| 2014 | 26.62 | 89 |
| 2013 | 26.61 | 89 |
| 2012 | 27.07 | 84 |
| 2011 | 27.02 | 91 |
| 2010 | 27.06 | 92 |
| 2009 | 27.68 | 79 |
| 2008 | 27.9 | 87 |
| 2007 | 28.1 | 85 |
| 2006 | 28.73 | 85 |
| 2005 | 29.04 | 76 |
| 2004 | 29.87 | 70 |
| 2003 | 28.87 | 74 |
| 2002 | 28.3 | 79 |
| 2001 | 28.87 | 76 |
| 2000 | 29.33 | 75 |
| 1999 | 29.08 | 72 |
| 1998 | 30.3 | 65 |
| 1997 | 31.91 | 49 |
| 1996 | 30.83 | 61 |
| 1995 | 32.31 | 54 |