| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 26.41 | 27 |
| 2015 | 25.89 | 49 |
| 2014 | 25.19 | 54 |
| 2013 | 26.47 | 60 |
| 2012 | 27 | 55 |
| 2011 | 26.92 | 53 |
| 2010 | 26.76 | 50 |
| 2009 | 25.94 | 54 |
| 2008 | 24.42 | 62 |
| 2007 | 23.27 | 68 |
| 2006 | 23.68 | 62 |
| 2005 | 24.05 | 58 |
| 2004 | 22.24 | 61 |
| 2003 | 22.15 | 55 |
| 2002 | 18.9 | 70 |
| 2001 | 19.76 | 64 |
| 2000 | 20.11 | 58 |
| 1999 | 25.02 | 39 |
| 1998 | 28.37 | 34 |
| 1997 | 27.71 | 33 |
| 1996 | 32.34 | 29 |
| 1995 | 16.69 | 67 |