| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 26.66 | 18 |
| 2015 | 28.63 | 16 |
| 2014 | 30.92 | 13 |
| 2013 | 33.94 | 13 |
| 2012 | 36.05 | 12 |
| 2011 | 37.11 | 10 |
| 2010 | 36.46 | 10 |
| 2009 | 36.07 | 10 |
| 2008 | 35.23 | 12 |
| 2007 | 32.26 | 16 |
| 2006 | 31.98 | 19 |
| 2005 | 32.74 | 20 |
| 2004 | 31.48 | 22 |
| 2003 | 33.92 | 21 |
| 2002 | 33.19 | 23 |
| 2001 | 36.47 | 17 |
| 2000 | 38.28 | 14 |
| 1999 | 43.73 | 10 |
| 1998 | 46.86 | 9 |
| 1997 | 46.93 | 9 |
| 1996 | 46.93 | 10 |
| 1995 | 50.07 | 8 |
| 1994 | 47.81 | 9 |
| 1993 | 46.63 | 14 |