| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 31.05 | 14 |
| 2015 | 31.08 | 13 |
| 2014 | 31.01 | 12 |
| 2013 | 33.29 | 14 |
| 2012 | 33.17 | 14 |
| 2011 | 31.29 | 13 |
| 2010 | 31.96 | 13 |
| 2009 | 32.37 | 18 |
| 2008 | 30.83 | 18 |
| 2007 | 28.78 | 22 |
| 2006 | 30.97 | 22 |
| 2005 | 30.46 | 25 |
| 2004 | 33.33 | 20 |
| 2003 | 32.53 | 25 |
| 2002 | 32.46 | 24 |
| 2001 | 32.87 | 24 |
| 2000 | 33.48 | 22 |
| 1999 | 34.13 | 25 |
| 1998 | 33.76 | 27 |
| 1997 | 46.8 | 11 |
| 1996 | 48.03 | 8 |
| 1995 | 47.14 | 11 |
| 1994 | 44.98 | 13 |
| 1993 | 48.11 | 13 |
| 1992 | 48 | 11 |
| 1991 | 48.14 | 7 |
| 1990 | 45.96 | 11 |