| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 32.38 | 36 |
| 2015 | 33.68 | 36 |
| 2014 | 35.62 | 36 |
| 2013 | 36.6 | 38 |
| 2012 | 37.1 | 37 |
| 2011 | 41.51 | 22 |
| 2010 | 41.34 | 24 |
| 2009 | 37.64 | 25 |
| 2008 | 37.78 | 37 |
| 2007 | 36.67 | 41 |
| 2006 | 36.86 | 39 |
| 2005 | 36.05 | 39 |
| 2004 | 35.04 | 44 |
| 2003 | 34.76 | 40 |
| 2002 | 36.9 | 31 |
| 2001 | 35.64 | 36 |
| 2000 | 33.51 | 47 |
| 1999 | 33.89 | 39 |
| 1998 | 35.72 | 24 |
| 1997 | 38.49 | 22 |
| 1996 | 39.71 | 18 |
| 1995 | 38.37 | 25 |
| 1994 | 46.28 | 11 |
| 1993 | 42.1 | 16 |
| 1992 | 43.97 | 16 |
| 1991 | 45.05 | 15 |
| 1990 | 49.94 | 8 |