| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 21.31 | 99 |
| 2015 | 17.73 | 135 |
| 2014 | 14.66 | 155 |
| 2013 | 11.92 | 166 |
| 2012 | 10.26 | 168 |
| 2011 | 10.47 | 169 |
| 2010 | 10.19 | 171 |
| 2009 | 10.26 | 169 |
| 2008 | 10.94 | 168 |
| 2007 | 12.47 | 167 |
| 2006 | 12.51 | 165 |
| 2005 | 12.8 | 163 |
| 2004 | 13.87 | 163 |
| 2003 | 13.88 | 160 |
| 2002 | 13.72 | 159 |
| 2001 | 12.86 | 160 |
| 2000 | 12.2 | 162 |
| 1999 | 13.04 | 155 |
| 1998 | 12.38 | 158 |
| 1997 | 13.04 | 157 |
| 1996 | 10.38 | 156 |
| 1995 | 9.84 | 156 |
| 1994 | 8.64 | 142 |
| 1993 | 7.76 | 138 |
| 1992 | 6.3 | 135 |
| 1991 | 7.61 | 132 |
| 1990 | 9.78 | 126 |
| 1989 | 10.92 | 110 |
| 1988 | 10.91 | 106 |
| 1987 | 11.64 | 106 |
| 1986 | 10.26 | 101 |