| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4 | 38 |
| 2015 | 3.87 | 38 |
| 2014 | 3.62 | 36 |
| 2013 | 3.72 | 37 |
| 2012 | 3.72 | 37 |
| 2011 | 3.71 | 35 |
| 2010 | 3.7 | 30 |
| 2009 | 4.62 | 42 |
| 2008 | 5.11 | 60 |
| 2007 | 5.6 | 68 |
| 2006 | 4.16 | 44 |
| 2005 | 4.94 | 52 |
| 2004 | 3.98 | 34 |
| 2003 | 4.09 | 35 |
| 2002 | 4.21 | 37 |
| 2001 | 4.37 | 43 |
| 2000 | 4.54 | 45 |
| 1999 | 4.72 | 46 |
| 1998 | 4.92 | 48 |
| 1997 | 5.13 | 50 |
| 1996 | 5.36 | 52 |
| 1995 | 4.33 | 42 |
| 1994 | 4.16 | 41 |
| 1993 | 4.05 | 42 |
| 1992 | 4.04 | 46 |
| 1991 | 4.24 | 49 |