| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 19.35 | 105 |
| 2015 | 19.5 | 128 |
| 2014 | 19.57 | 130 |
| 2013 | 19.84 | 131 |
| 2012 | 19.69 | 133 |
| 2011 | 19.83 | 135 |
| 2010 | 19.6 | 136 |
| 2009 | 20.04 | 129 |
| 2008 | 20.68 | 134 |
| 2007 | 21.06 | 130 |
| 2006 | 21.25 | 129 |
| 2005 | 21.51 | 124 |
| 2004 | 21.85 | 127 |
| 2003 | 22.07 | 127 |
| 2002 | 22.56 | 121 |
| 2001 | 22.91 | 120 |
| 2000 | 23.34 | 109 |
| 1999 | 23.34 | 115 |
| 1998 | 23.61 | 113 |
| 1997 | 23.71 | 108 |
| 1996 | 23.9 | 109 |
| 1995 | 24.52 | 106 |
| 1994 | 24.43 | 91 |
| 1993 | 25.18 | 87 |
| 1992 | 26.23 | 80 |
| 1991 | 26.69 | 81 |
| 1990 | 26.91 | 76 |
| 1989 | 26.91 | 66 |
| 1988 | 27.63 | 62 |
| 1987 | 27.69 | 59 |
| 1986 | 28.12 | 53 |