| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 27.85 | 137 |
| 2015 | 27.78 | 135 |
| 2014 | 27.76 | 133 |
| 2013 | 28.08 | 131 |
| 2012 | 28.19 | 134 |
| 2011 | 29.61 | 131 |
| 2010 | 29.91 | 131 |
| 2009 | 30.14 | 131 |
| 2008 | 31.65 | 131 |
| 2007 | 32.63 | 129 |
| 2006 | 33.49 | 123 |
| 2005 | 35.53 | 112 |
| 2004 | 36.92 | 99 |
| 2003 | 35.56 | 109 |
| 2002 | 34.18 | 121 |
| 2001 | 34.43 | 122 |
| 2000 | 37.3 | 106 |
| 1999 | 38.22 | 104 |
| 1998 | 32.35 | 139 |
| 1997 | 35.01 | 126 |
| 1996 | 33.89 | 136 |
| 1995 | 30.74 | 147 |
| 1994 | 33.03 | 139 |
| 1993 | 36.61 | 124 |
| 1992 | 36.53 | 127 |
| 1991 | 35.41 | 135 |