| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.08 | 94 |
| 2015 | 2.11 | 94 |
| 2014 | 2.14 | 92 |
| 2013 | 2.17 | 91 |
| 2012 | 2.19 | 91 |
| 2011 | 2.2 | 91 |
| 2010 | 2.21 | 89 |
| 2009 | 2.22 | 90 |
| 2008 | 2.24 | 88 |
| 2007 | 2.26 | 87 |
| 2006 | 2.28 | 89 |
| 2005 | 2.31 | 89 |
| 2004 | 2.33 | 86 |
| 2003 | 2.35 | 86 |
| 2002 | 2.38 | 90 |
| 2001 | 2.41 | 92 |
| 2000 | 3.18 | 63 |
| 1999 | 3.34 | 59 |
| 1998 | 3.4 | 58 |
| 1997 | 3.43 | 60 |
| 1996 | 3.47 | 61 |
| 1995 | 3.5 | 57 |
| 1994 | 3.54 | 57 |
| 1993 | 3.57 | 60 |
| 1992 | 3.62 | 64 |
| 1991 | 3.66 | 70 |
| 1990 | 2.86 | 93 |
| 1989 | 2.76 | 103 |
| 1988 | 2.79 | 102 |
| 1987 | 2.81 | 107 |
| 1986 | 2.85 | 105 |