| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 48.76 | 57 |
| 2015 | 49.09 | 61 |
| 2014 | 48.91 | 63 |
| 2013 | 48.74 | 64 |
| 2012 | 48.59 | 66 |
| 2011 | 48.47 | 66 |
| 2010 | 48.41 | 64 |
| 2009 | 48.92 | 68 |
| 2008 | 49.45 | 69 |
| 2007 | 50.05 | 72 |
| 2006 | 50.79 | 73 |
| 2005 | 51.71 | 77 |
| 2004 | 53.1 | 81 |
| 2003 | 54.72 | 84 |
| 2002 | 56.52 | 85 |
| 2001 | 58.39 | 86 |
| 2000 | 60.24 | 89 |
| 1999 | 62.11 | 94 |
| 1998 | 63.91 | 95 |
| 1997 | 65.69 | 96 |
| 1996 | 67.58 | 97 |
| 1995 | 69.68 | 102 |
| 1994 | 71.97 | 103 |
| 1993 | 74.42 | 104 |
| 1992 | 76.94 | 109 |
| 1991 | 79.31 | 114 |
| 1990 | 81.36 | 118 |
| 1989 | 83.61 | 119 |
| 1988 | 85.63 | 123 |
| 1987 | 87.47 | 126 |
| 1986 | 89.21 | 135 |