| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 23.67 | 88 |
| 2015 | 22.93 | 106 |
| 2014 | 22.5 | 109 |
| 2013 | 23.19 | 114 |
| 2012 | 23.63 | 112 |
| 2011 | 23.47 | 114 |
| 2010 | 22.83 | 115 |
| 2009 | 23.14 | 106 |
| 2008 | 26.34 | 98 |
| 2007 | 26.13 | 100 |
| 2006 | 26.87 | 95 |
| 2005 | 26.17 | 98 |
| 2004 | 25.81 | 101 |
| 2003 | 25.77 | 98 |
| 2002 | 26.37 | 93 |
| 2001 | 26.58 | 95 |
| 2000 | 27.46 | 86 |
| 1999 | 26.53 | 91 |
| 1998 | 26.2 | 93 |
| 1997 | 26.15 | 96 |
| 1996 | 25.89 | 97 |
| 1995 | 25.52 | 100 |
| 1994 | 24.93 | 88 |
| 1993 | 24.75 | 88 |
| 1992 | 25.82 | 82 |
| 1991 | 25.75 | 86 |
| 1990 | 26.07 | 81 |
| 1989 | 26.34 | 71 |
| 1988 | 26.36 | 68 |
| 1987 | 26.71 | 65 |
| 1986 | 26.68 | 61 |