| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.38 | 16 |
| 2015 | 2.45 | 18 |
| 2014 | 2.63 | 18 |
| 2013 | 2.87 | 19 |
| 2012 | 2.05 | 16 |
| 2011 | 3.23 | 25 |
| 2010 | 3.32 | 25 |
| 2009 | 3.96 | 33 |
| 2008 | 3.74 | 40 |
| 2007 | 3.7 | 36 |
| 2006 | 3.1 | 23 |
| 2005 | 3.06 | 20 |
| 2004 | 2.5 | 15 |
| 2003 | 1.8 | 10 |
| 2002 | 1.86 | 11 |
| 2001 | 1.9 | 15 |
| 2000 | 1.7 | 11 |
| 1999 | 1.4 | 8 |
| 1998 | 1.4 | 8 |
| 1997 | 3.52 | 34 |
| 1996 | 1.6 | 14 |
| 1995 | 1.37 | 11 |
| 1994 | 2.13 | 15 |
| 1993 | 3.27 | 35 |
| 1992 | 2.91 | 27 |
| 1991 | 2.6 | 26 |