| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 40.99 | 95 |
| 2015 | 44.14 | 102 |
| 2014 | 36.08 | 114 |
| 2013 | 31.97 | 125 |
| 2012 | 31.53 | 120 |
| 2011 | 26.99 | 130 |
| 2010 | 22.38 | 144 |
| 2009 | 22.27 | 144 |
| 2008 | 18.1 | 153 |
| 2007 | 17.97 | 157 |
| 2006 | 15.34 | 160 |
| 2005 | 13.14 | 160 |
| 2004 | 12.78 | 158 |
| 2003 | 12.86 | 154 |
| 2002 | 12.66 | 154 |
| 2001 | 11.55 | 154 |
| 2000 | 14.58 | 149 |
| 1999 | 14.55 | 143 |
| 1998 | 15.3 | 135 |
| 1997 | 14.88 | 136 |
| 1996 | 14.17 | 137 |
| 1995 | 15.07 | 136 |
| 1994 | 16.21 | 126 |
| 1993 | 16.35 | 128 |
| 1992 | 21.79 | 107 |
| 1991 | 20.23 | 104 |
| 1990 | 21.43 | 98 |
| 1989 | 18.09 | 109 |
| 1988 | 20.3 | 99 |
| 1987 | 20.29 | 101 |
| 1986 | 20.65 | 95 |