| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 20.08 | 124 |
| 2015 | 19.54 | 143 |
| 2014 | 20.16 | 141 |
| 2013 | 21.36 | 140 |
| 2012 | 21.2 | 142 |
| 2011 | 20.68 | 146 |
| 2010 | 21.02 | 147 |
| 2009 | 43.27 | 93 |
| 2008 | 37.77 | 96 |
| 2007 | 28.06 | 124 |
| 2006 | 19.04 | 147 |
| 2005 | 17.73 | 145 |
| 2004 | 18.26 | 139 |
| 2003 | 20.2 | 131 |
| 2002 | 21.83 | 125 |
| 2001 | 26.67 | 110 |
| 2000 | 21.96 | 115 |
| 1999 | 21.13 | 114 |
| 1998 | 18.66 | 124 |
| 1997 | 14.78 | 137 |
| 1996 | 13.23 | 140 |
| 1995 | 15.87 | 131 |
| 1994 | 28.23 | 92 |
| 1993 | 27.75 | 92 |
| 1992 | 23.24 | 104 |
| 1991 | 24.03 | 94 |
| 1990 | 20.44 | 105 |
| 1989 | 18.98 | 105 |
| 1988 | 25.96 | 82 |
| 1987 | 25.82 | 85 |
| 1986 | 31.51 | 64 |