| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 18.17 | 173 |
| 2015 | 18.5 | 170 |
| 2014 | 17.43 | 171 |
| 2013 | 17.98 | 169 |
| 2012 | 17.85 | 172 |
| 2011 | 16.31 | 177 |
| 2010 | 16.56 | 176 |
| 2009 | 20.42 | 170 |
| 2008 | 22.8 | 166 |
| 2007 | 24.8 | 155 |
| 2006 | 27.31 | 143 |
| 2005 | 29.35 | 139 |
| 2004 | 28.73 | 142 |
| 2003 | 28.44 | 141 |
| 2002 | 27.38 | 148 |
| 2001 | 27.51 | 152 |
| 2000 | 28.06 | 153 |
| 1999 | 28.66 | 150 |
| 1998 | 27.91 | 153 |
| 1997 | 27.05 | 152 |
| 1996 | 24.94 | 165 |
| 1995 | 24.19 | 166 |
| 1994 | 24.44 | 167 |
| 1993 | 23.66 | 167 |
| 1992 | 19.86 | 181 |
| 1991 | 21.13 | 178 |