| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 39.72 | 96 |
| 2015 | 39.91 | 95 |
| 2014 | 40.11 | 96 |
| 2013 | 40.51 | 96 |
| 2012 | 41.07 | 97 |
| 2011 | 41.65 | 97 |
| 2010 | 42.17 | 97 |
| 2009 | 43.03 | 97 |
| 2008 | 43.88 | 97 |
| 2007 | 44.87 | 98 |
| 2006 | 46.26 | 99 |
| 2005 | 48.21 | 100 |
| 2004 | 50.4 | 104 |
| 2003 | 53.1 | 107 |
| 2002 | 56.09 | 110 |
| 2001 | 58.91 | 112 |
| 2000 | 61.24 | 113 |
| 1999 | 63.6 | 114 |
| 1998 | 65.47 | 115 |
| 1997 | 66.99 | 113 |
| 1996 | 68.56 | 113 |
| 1995 | 70.56 | 116 |
| 1994 | 72.2 | 114 |
| 1993 | 73.35 | 115 |
| 1992 | 73.85 | 116 |
| 1991 | 73.73 | 117 |
| 1990 | 73.18 | 115 |
| 1989 | 71.59 | 110 |
| 1988 | 70.62 | 107 |
| 1987 | 69.98 | 103 |
| 1986 | 69.27 | 99 |