| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 41.09 | 73 |
| 2015 | 41.27 | 69 |
| 2014 | 41.51 | 69 |
| 2013 | 42.44 | 67 |
| 2012 | 43.07 | 62 |
| 2011 | 43.7 | 59 |
| 2010 | 44.35 | 56 |
| 2009 | 44.99 | 55 |
| 2008 | 47.25 | 51 |
| 2007 | 48.82 | 46 |
| 2006 | 49.47 | 44 |
| 2005 | 50.66 | 41 |
| 2004 | 52.72 | 35 |
| 2003 | 54.51 | 32 |
| 2002 | 54.58 | 33 |
| 2001 | 55.56 | 30 |
| 2000 | 56.53 | 27 |
| 1999 | 57.35 | 25 |
| 1998 | 58.23 | 24 |
| 1997 | 57.18 | 26 |
| 1996 | 59.13 | 22 |
| 1995 | 57.98 | 25 |
| 1994 | 60.83 | 22 |
| 1993 | 63.36 | 20 |
| 1992 | 61.49 | 22 |
| 1991 | 66.61 | 18 |