| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.78 | 52 |
| 2015 | 1.68 | 64 |
| 2014 | 1.54 | 72 |
| 2013 | 1.6 | 66 |
| 2012 | 1.66 | 61 |
| 2011 | 1.75 | 53 |
| 2010 | 1.87 | 55 |
| 2009 | 1.82 | 60 |
| 2008 | 1.63 | 70 |
| 2007 | 1.68 | 68 |
| 2006 | 1.87 | 60 |
| 2005 | 2.01 | 56 |
| 2004 | 1.94 | 62 |
| 2003 | 1.98 | 65 |
| 2002 | 2.09 | 62 |
| 2001 | 3.1 | 34 |
| 2000 | 2.77 | 40 |
| 1999 | 2.73 | 41 |
| 1998 | 4.68 | 20 |
| 1997 | 5.57 | 14 |
| 1996 | 4.52 | 18 |
| 1995 | 3.04 | 35 |
| 1994 | 4.02 | 20 |
| 1993 | 4.07 | 25 |
| 1992 | 9.13 | 6 |
| 1991 | 7.26 | 8 |
| 1990 | 7.37 | 11 |
| 1989 | 5.37 | 18 |
| 1988 | 5.7 | 15 |
| 1987 | 5.39 | 18 |
| 1986 | 1.58 | 83 |