| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.09 | 57 |
| 2015 | 5.11 | 57 |
| 2014 | 5.13 | 57 |
| 2013 | 5.18 | 57 |
| 2012 | 5.3 | 59 |
| 2011 | 5.37 | 58 |
| 2010 | 6.26 | 65 |
| 2009 | 5.47 | 57 |
| 2008 | 5.43 | 63 |
| 2007 | 5.53 | 64 |
| 2006 | 5.68 | 62 |
| 2005 | 4.85 | 50 |
| 2004 | 4.17 | 37 |
| 2003 | 4.53 | 44 |
| 2002 | 5.26 | 50 |
| 2001 | 6.11 | 65 |
| 2000 | 4.75 | 50 |
| 1999 | 6 | 60 |
| 1998 | 6.59 | 70 |
| 1997 | 6.93 | 82 |
| 1996 | 6.05 | 61 |
| 1995 | 5.51 | 59 |
| 1994 | 5 | 54 |
| 1993 | 5.95 | 68 |
| 1992 | 5.85 | 68 |
| 1991 | 5.77 | 65 |