| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 56.91 | 48 |
| 2015 | 57.19 | 46 |
| 2014 | 56.72 | 47 |
| 2013 | 56.86 | 47 |
| 2012 | 57.02 | 48 |
| 2011 | 56.19 | 49 |
| 2010 | 55.37 | 53 |
| 2009 | 53.51 | 57 |
| 2008 | 53.93 | 56 |
| 2007 | 53.04 | 60 |
| 2006 | 52.38 | 62 |
| 2005 | 50.24 | 69 |
| 2004 | 48.77 | 72 |
| 2003 | 48.35 | 72 |
| 2002 | 47.92 | 75 |
| 2001 | 49.97 | 71 |
| 2000 | 50.67 | 66 |
| 1999 | 48.64 | 70 |
| 1998 | 48.41 | 71 |
| 1997 | 49.06 | 68 |
| 1996 | 49.01 | 69 |
| 1995 | 47.96 | 73 |
| 1994 | 48.12 | 71 |
| 1993 | 47.95 | 73 |
| 1992 | 48.55 | 67 |
| 1991 | 48.71 | 67 |