| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.38 | 15 |
| 2015 | 2.42 | 16 |
| 2014 | 2.91 | 23 |
| 2013 | 2.99 | 23 |
| 2012 | 2.87 | 22 |
| 2011 | 4.13 | 41 |
| 2010 | 3.74 | 32 |
| 2009 | 3.08 | 21 |
| 2008 | 2.79 | 23 |
| 2007 | 2.5 | 20 |
| 2006 | 1.8 | 12 |
| 2005 | 2.48 | 16 |
| 2004 | 3.13 | 22 |
| 2003 | 3.4 | 24 |
| 2002 | 3.13 | 23 |
| 2001 | 1.3 | 7 |
| 2000 | 1.4 | 6 |
| 1999 | 1.9 | 13 |
| 1998 | 2.52 | 15 |
| 1997 | 2.58 | 21 |
| 1996 | 3.75 | 34 |
| 1995 | 2.69 | 22 |
| 1994 | 3.15 | 29 |
| 1993 | 2.87 | 24 |
| 1992 | 2.49 | 19 |
| 1991 | 3.2 | 36 |