| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 58.15 | 43 |
| 2015 | 58.61 | 41 |
| 2014 | 59.06 | 40 |
| 2013 | 59.31 | 39 |
| 2012 | 59.38 | 41 |
| 2011 | 57 | 47 |
| 2010 | 55.81 | 49 |
| 2009 | 54.72 | 52 |
| 2008 | 57.47 | 49 |
| 2007 | 57 | 48 |
| 2006 | 56.29 | 48 |
| 2005 | 54.76 | 51 |
| 2004 | 56.73 | 44 |
| 2003 | 56.66 | 41 |
| 2002 | 56.53 | 41 |
| 2001 | 56.64 | 41 |
| 2000 | 51.59 | 60 |
| 1999 | 53.14 | 53 |
| 1998 | 54.31 | 45 |
| 1997 | 53.63 | 48 |
| 1996 | 52.96 | 51 |
| 1995 | 52.68 | 49 |
| 1994 | 50.57 | 60 |
| 1993 | 49.93 | 59 |
| 1992 | 49.33 | 66 |
| 1991 | 48.79 | 66 |