| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 57.65 | 100 |
| 2015 | 58.09 | 97 |
| 2014 | 57.27 | 99 |
| 2013 | 56.56 | 103 |
| 2012 | 55.52 | 109 |
| 2011 | 54.55 | 113 |
| 2010 | 51.1 | 130 |
| 2009 | 53.22 | 123 |
| 2008 | 58.39 | 94 |
| 2007 | 58.25 | 94 |
| 2006 | 57.31 | 100 |
| 2005 | 54.25 | 115 |
| 2004 | 53.27 | 118 |
| 2003 | 52.57 | 119 |
| 2002 | 51.92 | 127 |
| 2001 | 51.18 | 130 |
| 2000 | 51.06 | 132 |
| 1999 | 52.56 | 127 |
| 1998 | 54.93 | 103 |
| 1997 | 54.99 | 104 |
| 1996 | 55.37 | 103 |
| 1995 | 55.59 | 104 |
| 1994 | 58.41 | 77 |
| 1993 | 60.53 | 63 |
| 1992 | 63.87 | 40 |
| 1991 | 66.79 | 36 |