| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.48 | 121 |
| 2015 | 4.51 | 117 |
| 2014 | 4.6 | 114 |
| 2013 | 4.69 | 115 |
| 2012 | 4.79 | 114 |
| 2011 | 4.89 | 110 |
| 2010 | 4.99 | 104 |
| 2009 | 5.09 | 102 |
| 2008 | 5.2 | 101 |
| 2007 | 5.3 | 99 |
| 2006 | 5.4 | 98 |
| 2005 | 5.49 | 96 |
| 2004 | 5.58 | 94 |
| 2003 | 5.65 | 90 |
| 2002 | 5.73 | 86 |
| 2001 | 5.79 | 84 |
| 2000 | 5.84 | 82 |
| 1999 | 5.88 | 79 |
| 1998 | 5.91 | 77 |
| 1997 | 5.94 | 76 |
| 1996 | 5.95 | 75 |
| 1995 | 5.96 | 74 |
| 1994 | 5.97 | 72 |
| 1993 | 5.98 | 70 |
| 1992 | 5.99 | 68 |
| 1991 | 5.99 | 68 |
| 1990 | 5.99 | 65 |
| 1989 | 6 | 63 |
| 1988 | 6.03 | 61 |
| 1987 | 6.05 | 60 |
| 1986 | 6.06 | 59 |