| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 23.75 | 87 |
| 2015 | 23.03 | 104 |
| 2014 | 19.38 | 131 |
| 2013 | 17.33 | 145 |
| 2012 | 19.41 | 134 |
| 2011 | 18.75 | 138 |
| 2010 | 15.54 | 158 |
| 2009 | 15.06 | 157 |
| 2008 | 18.03 | 143 |
| 2007 | 13.24 | 166 |
| 2006 | 13.52 | 164 |
| 2005 | 15.32 | 157 |
| 2004 | 13.3 | 164 |
| 2003 | 13.82 | 161 |
| 2002 | 13.67 | 160 |
| 2001 | 13.34 | 159 |
| 2000 | 15.04 | 154 |
| 1999 | 15.57 | 148 |
| 1998 | 14.88 | 147 |
| 1997 | 13.95 | 154 |
| 1996 | 12.81 | 151 |
| 1995 | 13.53 | 151 |