| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 27.19 | 113 |
| 2015 | 25.56 | 132 |
| 2014 | 24.29 | 132 |
| 2013 | 24.17 | 136 |
| 2012 | 24.9 | 134 |
| 2011 | 25.3 | 134 |
| 2010 | 23.85 | 140 |
| 2009 | 23.82 | 139 |
| 2008 | 22.44 | 143 |
| 2007 | 23.39 | 139 |
| 2006 | 22.48 | 134 |
| 2005 | 20.13 | 137 |
| 2004 | 24.37 | 121 |
| 2003 | 23.41 | 125 |
| 2002 | 24.27 | 120 |
| 2001 | 22.63 | 119 |
| 2000 | 20.79 | 122 |
| 1999 | 19.93 | 120 |
| 1998 | 19.2 | 121 |
| 1997 | 20.38 | 120 |
| 1996 | 18.77 | 121 |
| 1995 | 19.48 | 119 |
| 1994 | 24.75 | 102 |
| 1993 | 22.96 | 106 |
| 1992 | 21.15 | 109 |
| 1991 | 20.03 | 106 |
| 1990 | 16.16 | 115 |
| 1989 | 17.78 | 110 |
| 1988 | 15.5 | 112 |
| 1987 | 15.86 | 113 |
| 1986 | 16.66 | 106 |