| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 24.11 | 117 |
| 2015 | 25.1 | 133 |
| 2014 | 23.47 | 135 |
| 2013 | 24.93 | 135 |
| 2012 | 22.29 | 139 |
| 2011 | 20.7 | 145 |
| 2010 | 19.66 | 149 |
| 2009 | 20.33 | 146 |
| 2008 | 16.13 | 158 |
| 2007 | 16.95 | 158 |
| 2006 | 17.71 | 152 |
| 2005 | 16.48 | 149 |
| 2004 | 15.13 | 152 |
| 2003 | 14.96 | 147 |
| 2002 | 15.54 | 145 |
| 2001 | 14.93 | 144 |
| 2000 | 14.61 | 148 |
| 1999 | 15.53 | 140 |
| 1998 | 17.38 | 128 |
| 1997 | 15.06 | 134 |
| 1996 | 14.45 | 134 |
| 1995 | 14.5 | 138 |
| 1994 | 14.01 | 129 |
| 1993 | 15.5 | 129 |
| 1992 | 16.31 | 122 |
| 1991 | 18.81 | 113 |
| 1990 | 16.34 | 114 |
| 1989 | 19.12 | 104 |
| 1988 | 21.12 | 97 |
| 1987 | 24.41 | 88 |
| 1986 | 23.47 | 87 |