| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 18.5 | 170 |
| 2015 | 19.11 | 170 |
| 2014 | 20.2 | 172 |
| 2013 | 20.27 | 171 |
| 2012 | 20.29 | 172 |
| 2011 | 20.39 | 174 |
| 2010 | 20.39 | 175 |
| 2009 | 18.35 | 170 |
| 2008 | 16.68 | 171 |
| 2007 | 16.71 | 166 |
| 2006 | 16.78 | 165 |
| 2005 | 16.9 | 164 |
| 2004 | 16.73 | 162 |
| 2003 | 16.83 | 164 |
| 2002 | 16.83 | 161 |
| 2001 | 17 | 163 |
| 2000 | 17.11 | 166 |
| 1999 | 17.24 | 165 |
| 1998 | 17.38 | 165 |
| 1997 | 20.43 | 175 |
| 1996 | 17.53 | 164 |
| 1995 | 18.96 | 169 |
| 1994 | 17.67 | 159 |
| 1993 | 17.78 | 159 |
| 1992 | 19.13 | 169 |
| 1991 | 21.56 | 178 |