| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 21.85 | 96 |
| 2015 | 22.89 | 107 |
| 2014 | 23.22 | 107 |
| 2013 | 23.8 | 106 |
| 2012 | 24.21 | 105 |
| 2011 | 24.11 | 110 |
| 2010 | 23.86 | 109 |
| 2009 | 23.71 | 102 |
| 2008 | 24.48 | 104 |
| 2007 | 24.53 | 107 |
| 2006 | 23.6 | 114 |
| 2005 | 22.88 | 118 |
| 2004 | 24.04 | 117 |
| 2003 | 23.89 | 112 |
| 2002 | 25.16 | 101 |
| 2001 | 25.43 | 99 |
| 2000 | 26.54 | 92 |
| 1999 | 27.82 | 80 |
| 1998 | 29.27 | 67 |
| 1997 | 31.59 | 52 |
| 1996 | 30.03 | 71 |
| 1995 | 30.26 | 73 |