| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.01 | 39 |
| 2015 | 4.34 | 44 |
| 2014 | 4.83 | 50 |
| 2013 | 4.94 | 51 |
| 2012 | 4.92 | 52 |
| 2011 | 5.19 | 56 |
| 2010 | 5.33 | 53 |
| 2009 | 5.38 | 53 |
| 2008 | 3.9 | 41 |
| 2007 | 3.64 | 34 |
| 2006 | 3.57 | 32 |
| 2005 | 3.56 | 28 |
| 2004 | 3.66 | 29 |
| 2003 | 2.96 | 19 |
| 2002 | 2.86 | 18 |
| 2001 | 2.54 | 20 |
| 2000 | 2.56 | 21 |
| 1999 | 2.49 | 18 |
| 1998 | 3.57 | 32 |
| 1997 | 4.05 | 39 |
| 1996 | 5.25 | 50 |
| 1995 | 6.89 | 76 |
| 1994 | 4.25 | 42 |
| 1993 | 3.21 | 33 |
| 1992 | 3.1 | 29 |
| 1991 | 3.05 | 34 |