| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2014 | 21.76 | 115 |
| 2013 | 20.54 | 127 |
| 2012 | 21.04 | 125 |
| 2011 | 20.89 | 130 |
| 2010 | 20.77 | 126 |
| 2009 | 20.82 | 122 |
| 2008 | 22.66 | 118 |
| 2007 | 22.63 | 118 |
| 2006 | 23.6 | 113 |
| 2005 | 24.62 | 109 |
| 2004 | 24.31 | 114 |
| 2003 | 24.05 | 110 |
| 2002 | 24.5 | 104 |
| 2001 | 23.61 | 116 |
| 2000 | 24.09 | 106 |
| 1999 | 24.72 | 104 |
| 1998 | 24.45 | 106 |
| 1997 | 25.49 | 102 |
| 1996 | 25.75 | 99 |
| 1995 | 26.57 | 97 |
| 1994 | 27.34 | 78 |
| 1993 | 26.46 | 81 |
| 1992 | 26.3 | 79 |
| 1991 | 26.37 | 82 |
| 1990 | 26.85 | 77 |
| 1989 | 28.48 | 61 |
| 1988 | 28.17 | 60 |
| 1987 | 29.37 | 54 |
| 1986 | 31.25 | 44 |