| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.38 | 126 |
| 2015 | 1.34 | 121 |
| 2014 | 1.31 | 122 |
| 2013 | 1.26 | 123 |
| 2012 | 1.19 | 128 |
| 2011 | 1.11 | 132 |
| 2010 | 1.03 | 142 |
| 2009 | 1.02 | 142 |
| 2008 | 1.03 | 142 |
| 2007 | 1.09 | 137 |
| 2006 | 1.18 | 137 |
| 2005 | 1.29 | 132 |
| 2004 | 1.39 | 126 |
| 2003 | 1.47 | 126 |
| 2002 | 1.53 | 126 |
| 2001 | 1.56 | 125 |
| 2000 | 1.95 | 104 |
| 1999 | 2.05 | 99 |
| 1998 | 2.08 | 99 |
| 1997 | 2.12 | 101 |
| 1996 | 2.16 | 100 |
| 1995 | 2.19 | 101 |
| 1994 | 2.23 | 103 |
| 1993 | 2.27 | 106 |
| 1992 | 2.31 | 110 |
| 1991 | 2.37 | 114 |
| 1990 | 4.53 | 45 |
| 1989 | 5.04 | 32 |
| 1988 | 5.15 | 35 |
| 1987 | 5.23 | 35 |
| 1986 | 5.3 | 38 |