| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 50.65 | 37 |
| 2015 | 50.96 | 34 |
| 2014 | 51.13 | 34 |
| 2013 | 51.5 | 35 |
| 2012 | 51.74 | 38 |
| 2011 | 51.96 | 36 |
| 2010 | 51.99 | 36 |
| 2009 | 51.78 | 37 |
| 2008 | 52.61 | 37 |
| 2007 | 53.53 | 34 |
| 2006 | 54.46 | 31 |
| 2005 | 55.53 | 28 |
| 2004 | 56.52 | 27 |
| 2003 | 57.42 | 24 |
| 2002 | 58.44 | 21 |
| 2001 | 59.29 | 21 |
| 2000 | 60.05 | 21 |
| 1999 | 61.08 | 21 |
| 1998 | 62.02 | 17 |
| 1997 | 62.92 | 17 |
| 1996 | 63.91 | 16 |
| 1995 | 64.87 | 17 |
| 1994 | 65.67 | 16 |
| 1993 | 66.72 | 15 |
| 1992 | 67.57 | 15 |
| 1991 | 68.4 | 16 |