| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 51.81 | 69 |
| 2015 | 51.4 | 72 |
| 2014 | 51.05 | 73 |
| 2013 | 49.98 | 77 |
| 2012 | 49.63 | 77 |
| 2011 | 49.14 | 79 |
| 2010 | 48.09 | 85 |
| 2009 | 46.06 | 97 |
| 2008 | 45.76 | 99 |
| 2007 | 47.86 | 87 |
| 2006 | 48.56 | 85 |
| 2005 | 48.34 | 82 |
| 2004 | 49.2 | 69 |
| 2003 | 50.27 | 66 |
| 2002 | 49.26 | 70 |
| 2001 | 51.54 | 63 |
| 2000 | 49.01 | 70 |
| 1999 | 50.73 | 65 |
| 1998 | 50.09 | 64 |
| 1997 | 51.92 | 59 |
| 1996 | 52.39 | 54 |
| 1995 | 52.95 | 47 |
| 1994 | 52.81 | 47 |
| 1993 | 52.63 | 48 |
| 1992 | 51.35 | 57 |
| 1991 | 49.08 | 64 |