| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.74 | 69 |
| 2015 | 5.27 | 59 |
| 2014 | 4.98 | 53 |
| 2013 | 4.98 | 53 |
| 2012 | 5.92 | 67 |
| 2011 | 5.24 | 57 |
| 2010 | 5.16 | 51 |
| 2009 | 5.12 | 47 |
| 2008 | 5.22 | 62 |
| 2007 | 5.28 | 62 |
| 2006 | 5.26 | 57 |
| 2005 | 5.38 | 57 |
| 2004 | 5.32 | 55 |
| 2003 | 5.85 | 59 |
| 2002 | 6.43 | 70 |
| 2001 | 7.07 | 83 |
| 2000 | 5.15 | 56 |
| 1999 | 8.2 | 97 |
| 1998 | 7.16 | 82 |
| 1997 | 6.25 | 65 |
| 1996 | 5.45 | 55 |
| 1995 | 5.43 | 56 |
| 1994 | 5.42 | 59 |
| 1993 | 5.4 | 61 |
| 1992 | 5.46 | 62 |
| 1991 | 5.46 | 61 |