| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 52.88 | 92 |
| 2015 | 53.51 | 101 |
| 2014 | 54.45 | 105 |
| 2013 | 55.41 | 110 |
| 2012 | 56.46 | 114 |
| 2011 | 57.73 | 117 |
| 2010 | 59.32 | 120 |
| 2009 | 60.56 | 121 |
| 2008 | 62.25 | 122 |
| 2007 | 64.18 | 123 |
| 2006 | 66.03 | 125 |
| 2005 | 67.66 | 123 |
| 2004 | 68.22 | 121 |
| 2003 | 68.21 | 120 |
| 2002 | 67.78 | 118 |
| 2001 | 67.35 | 115 |
| 2000 | 67.21 | 111 |
| 1999 | 66.37 | 105 |
| 1998 | 65.99 | 99 |
| 1997 | 66.09 | 97 |
| 1996 | 66.38 | 96 |
| 1995 | 66.55 | 95 |
| 1994 | 66.56 | 91 |
| 1993 | 66.36 | 89 |
| 1992 | 66.17 | 86 |
| 1991 | 66.31 | 85 |
| 1990 | 66.91 | 84 |
| 1989 | 67.84 | 83 |
| 1988 | 69.59 | 86 |
| 1987 | 71.99 | 90 |
| 1986 | 74.56 | 95 |