| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 52.27 | 86 |
| 2015 | 52.55 | 91 |
| 2014 | 52.88 | 99 |
| 2013 | 53.22 | 100 |
| 2012 | 53.58 | 102 |
| 2011 | 53.99 | 106 |
| 2010 | 54.44 | 106 |
| 2009 | 54.97 | 107 |
| 2008 | 55.56 | 106 |
| 2007 | 56.21 | 104 |
| 2006 | 56.92 | 102 |
| 2005 | 57.68 | 101 |
| 2004 | 58.58 | 100 |
| 2003 | 59.57 | 101 |
| 2002 | 60.62 | 101 |
| 2001 | 61.64 | 101 |
| 2000 | 62.6 | 99 |
| 1999 | 63.63 | 98 |
| 1998 | 64.56 | 96 |
| 1997 | 65.42 | 95 |
| 1996 | 66.29 | 95 |
| 1995 | 67.25 | 96 |
| 1994 | 68.17 | 95 |
| 1993 | 69.12 | 94 |
| 1992 | 70.04 | 94 |
| 1991 | 70.78 | 93 |
| 1990 | 71.23 | 93 |
| 1989 | 71.8 | 92 |
| 1988 | 72.14 | 92 |
| 1987 | 72.39 | 92 |
| 1986 | 72.76 | 89 |