| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 25.52 | 93 |
| 2014 | 25.67 | 94 |
| 2013 | 26.05 | 93 |
| 2012 | 26.17 | 93 |
| 2011 | 26.61 | 94 |
| 2010 | 26.26 | 95 |
| 2009 | 26.16 | 94 |
| 2008 | 27.2 | 93 |
| 2007 | 26.88 | 96 |
| 2006 | 26.97 | 94 |
| 2005 | 26.76 | 94 |
| 2004 | 26.67 | 92 |
| 2003 | 26.88 | 90 |
| 2002 | 27.31 | 85 |
| 2001 | 27.12 | 86 |
| 2000 | 26.35 | 93 |
| 1999 | 27.13 | 85 |
| 1998 | 27.4 | 86 |
| 1997 | 28.12 | 85 |
| 1996 | 28.85 | 79 |
| 1995 | 30.01 | 74 |
| 1994 | 30.52 | 61 |
| 1993 | 29.67 | 67 |
| 1992 | 30.14 | 63 |
| 1991 | 30.94 | 60 |
| 1990 | 31.26 | 61 |