| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2014 | 24.44 | 181 |
| 2013 | 37.07 | 166 |
| 2012 | 38.99 | 165 |
| 2011 | 44.49 | 156 |
| 2010 | 26.64 | 184 |
| 2009 | 30.06 | 174 |
| 2008 | 46.04 | 149 |
| 2007 | 50.39 | 134 |
| 2006 | 54.06 | 121 |
| 2005 | 54.8 | 117 |
| 2004 | 50.11 | 121 |
| 2003 | 43.63 | 134 |
| 2002 | 42.78 | 133 |
| 2001 | 36.61 | 150 |
| 2000 | 42.46 | 133 |
| 1999 | 35.75 | 144 |
| 1998 | 36.71 | 143 |
| 1997 | 44.82 | 120 |
| 1996 | 48.25 | 107 |
| 1995 | 41.53 | 130 |
| 1994 | 44.71 | 101 |
| 1993 | 46.79 | 84 |
| 1992 | 48.33 | 81 |
| 1991 | 50.83 | 66 |
| 1990 | 52.8 | 68 |
| 1989 | 50.13 | 74 |
| 1988 | 39.31 | 94 |
| 1987 | 44.63 | 82 |
| 1986 | 29.19 | 116 |