| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 40.7 | 129 |
| 2015 | 36.01 | 156 |
| 2014 | 39.79 | 158 |
| 2013 | 37.76 | 164 |
| 2012 | 40.76 | 160 |
| 2011 | 42.57 | 162 |
| 2010 | 38.15 | 161 |
| 2009 | 34.19 | 166 |
| 2008 | 46.85 | 147 |
| 2007 | 43.49 | 152 |
| 2006 | 37.47 | 171 |
| 2005 | 33.74 | 169 |
| 2004 | 30.95 | 176 |
| 2003 | 32.64 | 163 |
| 2002 | 33.71 | 156 |
| 2001 | 37.38 | 145 |
| 2000 | 35.77 | 153 |
| 1999 | 27.84 | 163 |
| 1998 | 32.88 | 154 |
| 1997 | 32.71 | 155 |
| 1996 | 30.77 | 158 |
| 1995 | 32.63 | 156 |
| 1994 | 27.86 | 158 |
| 1993 | 22.06 | 149 |
| 1992 | 26.35 | 142 |
| 1991 | 24.18 | 139 |
| 1990 | 30.51 | 127 |
| 1989 | 26.42 | 132 |
| 1988 | 17.62 | 141 |
| 1987 | 20.56 | 138 |
| 1986 | 23.41 | 130 |