| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 52.99 | 94 |
| 2015 | 53.19 | 99 |
| 2014 | 53.5 | 101 |
| 2013 | 53.81 | 103 |
| 2012 | 54.17 | 106 |
| 2011 | 54.61 | 108 |
| 2010 | 55.18 | 108 |
| 2009 | 55.91 | 108 |
| 2008 | 56.77 | 109 |
| 2007 | 57.72 | 108 |
| 2006 | 58.69 | 109 |
| 2005 | 59.63 | 108 |
| 2004 | 60.65 | 107 |
| 2003 | 61.67 | 105 |
| 2002 | 62.65 | 105 |
| 2001 | 63.61 | 105 |
| 2000 | 64.58 | 104 |
| 1999 | 65.44 | 102 |
| 1998 | 66.24 | 101 |
| 1997 | 66.99 | 99 |
| 1996 | 67.77 | 98 |
| 1995 | 68.59 | 97 |
| 1994 | 69.67 | 97 |
| 1993 | 70.84 | 98 |
| 1992 | 72.03 | 99 |
| 1991 | 73.09 | 101 |
| 1990 | 73.9 | 100 |
| 1989 | 75.05 | 101 |
| 1988 | 75.99 | 101 |
| 1987 | 76.83 | 101 |
| 1986 | 77.74 | 101 |