| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.7 | 41 |
| 2015 | 1.72 | 41 |
| 2014 | 1.74 | 40 |
| 2013 | 1.76 | 41 |
| 2012 | 1.79 | 42 |
| 2011 | 1.83 | 46 |
| 2010 | 1.87 | 49 |
| 2009 | 1.91 | 48 |
| 2008 | 1.96 | 46 |
| 2007 | 2.01 | 45 |
| 2006 | 2.06 | 40 |
| 2005 | 2.11 | 37 |
| 2004 | 2.6 | 19 |
| 2003 | 2.64 | 20 |
| 2002 | 2.68 | 18 |
| 2001 | 2.71 | 16 |
| 2000 | 2.75 | 19 |
| 1999 | 2.78 | 20 |
| 1998 | 2.8 | 20 |
| 1997 | 2.8 | 21 |
| 1996 | 2.77 | 21 |
| 1995 | 2.73 | 24 |
| 1994 | 2.66 | 27 |
| 1993 | 2.24 | 47 |
| 1992 | 2.21 | 47 |
| 1991 | 2.2 | 47 |
| 1990 | 2.18 | 44 |
| 1989 | 2.16 | 46 |
| 1988 | 2.14 | 52 |
| 1987 | 2.16 | 51 |
| 1986 | 2.18 | 48 |