| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 47.73 | 50 |
| 2015 | 47.68 | 52 |
| 2014 | 47.81 | 56 |
| 2013 | 48.27 | 60 |
| 2012 | 49.01 | 67 |
| 2011 | 49.88 | 79 |
| 2010 | 50.7 | 82 |
| 2009 | 52.14 | 92 |
| 2008 | 53.77 | 99 |
| 2007 | 55.58 | 103 |
| 2006 | 57.61 | 106 |
| 2005 | 59.84 | 109 |
| 2004 | 62.24 | 112 |
| 2003 | 64.69 | 115 |
| 2002 | 67.13 | 117 |
| 2001 | 69.58 | 118 |
| 2000 | 72.08 | 119 |
| 1999 | 74.27 | 120 |
| 1998 | 76.33 | 122 |
| 1997 | 78.16 | 122 |
| 1996 | 79.65 | 122 |
| 1995 | 80.69 | 124 |
| 1994 | 81.41 | 123 |
| 1993 | 81.71 | 120 |
| 1992 | 81.7 | 118 |
| 1991 | 81.48 | 118 |
| 1990 | 81.1 | 116 |
| 1989 | 81.18 | 114 |
| 1988 | 81.26 | 113 |
| 1987 | 81.33 | 112 |
| 1986 | 81.34 | 110 |