| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.13 | 92 |
| 2015 | 2.24 | 90 |
| 2014 | 2.35 | 78 |
| 2013 | 2.48 | 77 |
| 2012 | 2.62 | 76 |
| 2011 | 2.77 | 72 |
| 2010 | 2.89 | 73 |
| 2009 | 3.01 | 67 |
| 2008 | 3.13 | 63 |
| 2007 | 3.23 | 62 |
| 2006 | 3.33 | 60 |
| 2005 | 3.42 | 55 |
| 2004 | 3.52 | 53 |
| 2003 | 3.66 | 50 |
| 2002 | 3.85 | 48 |
| 2001 | 4.08 | 35 |
| 2000 | 3.5 | 55 |
| 1999 | 3.68 | 48 |
| 1998 | 3.85 | 41 |
| 1997 | 3.97 | 41 |
| 1996 | 4.06 | 43 |
| 1995 | 4.14 | 35 |
| 1994 | 4.21 | 41 |
| 1993 | 4.27 | 43 |
| 1992 | 4.32 | 44 |
| 1991 | 4.35 | 50 |
| 1990 | 4.36 | 51 |
| 1989 | 4.37 | 53 |
| 1988 | 4.4 | 56 |
| 1987 | 4.46 | 60 |
| 1986 | 4.54 | 58 |