| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 29.96 | 144 |
| 2015 | 34.85 | 171 |
| 2014 | 36.92 | 177 |
| 2013 | 40.37 | 177 |
| 2012 | 40.71 | 177 |
| 2011 | 45.26 | 175 |
| 2010 | 47.94 | 165 |
| 2009 | 56.55 | 142 |
| 2008 | 71.68 | 130 |
| 2007 | 65.08 | 137 |
| 2006 | 61.52 | 141 |
| 2005 | 62.95 | 138 |
| 2004 | 57.82 | 144 |
| 2003 | 46.18 | 164 |
| 2002 | 40.99 | 165 |
| 2001 | 39.81 | 160 |
| 2000 | 39.02 | 161 |
| 1999 | 38.36 | 155 |
| 1998 | 41.93 | 152 |
| 1997 | 43.74 | 151 |
| 1996 | 46.95 | 138 |
| 1995 | 50.25 | 133 |
| 1994 | 50.63 | 122 |
| 1993 | 55.93 | 101 |
| 1992 | 59.31 | 93 |
| 1991 | 63.61 | 80 |
| 1990 | 52.76 | 100 |
| 1989 | 50.24 | 92 |
| 1988 | 52.48 | 80 |
| 1987 | 35.32 | 116 |
| 1986 | 41.33 | 98 |