| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 25.15 | 144 |
| 2015 | 24.81 | 142 |
| 2014 | 24.58 | 145 |
| 2013 | 24.63 | 142 |
| 2012 | 24.91 | 144 |
| 2011 | 23.96 | 147 |
| 2010 | 24.01 | 152 |
| 2009 | 24.42 | 153 |
| 2008 | 25.44 | 152 |
| 2007 | 27.3 | 142 |
| 2006 | 27.65 | 141 |
| 2005 | 29.05 | 140 |
| 2004 | 30.28 | 137 |
| 2003 | 30.42 | 137 |
| 2002 | 31.89 | 133 |
| 2001 | 31.12 | 138 |
| 2000 | 31.12 | 140 |
| 1999 | 29.73 | 146 |
| 1998 | 29.26 | 148 |
| 1997 | 34.61 | 132 |
| 1996 | 35.81 | 127 |
| 1995 | 36.24 | 126 |
| 1994 | 35.82 | 129 |
| 1993 | 34.54 | 137 |
| 1992 | 35.62 | 135 |
| 1991 | 35.91 | 133 |