| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.69 | 34 |
| 2015 | 3.81 | 36 |
| 2014 | 3.97 | 40 |
| 2013 | 4.02 | 41 |
| 2012 | 4.08 | 41 |
| 2011 | 4.13 | 40 |
| 2010 | 4.17 | 36 |
| 2009 | 4.2 | 36 |
| 2008 | 4 | 44 |
| 2007 | 3.18 | 29 |
| 2006 | 3.16 | 24 |
| 2005 | 3.1 | 23 |
| 2004 | 3.2 | 23 |
| 2003 | 2.8 | 18 |
| 2002 | 3.35 | 29 |
| 2001 | 3.31 | 27 |
| 2000 | 2.3 | 17 |
| 1999 | 3.28 | 28 |
| 1998 | 3.29 | 28 |
| 1997 | 2.61 | 23 |
| 1996 | 2.7 | 22 |
| 1995 | 1.8 | 13 |
| 1994 | 2.08 | 14 |
| 1993 | 3.27 | 34 |
| 1992 | 3.26 | 32 |
| 1991 | 3.21 | 37 |