| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.45 | 68 |
| 2015 | 1.44 | 77 |
| 2014 | 1.41 | 81 |
| 2013 | 1.4 | 79 |
| 2012 | 1.38 | 80 |
| 2011 | 1.49 | 70 |
| 2010 | 1.45 | 78 |
| 2009 | 1.7 | 68 |
| 2008 | 1.53 | 77 |
| 2007 | 1.34 | 94 |
| 2006 | 1.1 | 113 |
| 2005 | 1.05 | 120 |
| 2004 | 1.08 | 120 |
| 2003 | 1.24 | 110 |
| 2002 | 1.35 | 99 |
| 2001 | 1.43 | 94 |
| 2000 | 1.49 | 84 |
| 1999 | 1.62 | 75 |
| 1998 | 1.86 | 66 |
| 1997 | 2.17 | 58 |
| 1996 | 2.15 | 58 |
| 1995 | 2.27 | 59 |
| 1994 | 2.46 | 56 |
| 1993 | 2.45 | 56 |
| 1992 | 2.66 | 50 |
| 1991 | 2.65 | 56 |
| 1990 | 2.59 | 57 |
| 1989 | 2.68 | 51 |
| 1988 | 2.93 | 45 |
| 1987 | 3.36 | 44 |
| 1986 | 3.8 | 32 |