| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.32 | 77 |
| 2015 | 1.32 | 84 |
| 2014 | 1.33 | 86 |
| 2013 | 1.56 | 70 |
| 2012 | 1.67 | 60 |
| 2011 | 1.54 | 66 |
| 2010 | 1.56 | 70 |
| 2009 | 1.56 | 75 |
| 2008 | 1.62 | 72 |
| 2007 | 1.55 | 76 |
| 2006 | 1.46 | 86 |
| 2005 | 1.69 | 73 |
| 2004 | 1.61 | 80 |
| 2003 | 1.65 | 79 |
| 2002 | 1.63 | 80 |
| 2001 | 1.5 | 85 |
| 2000 | 1.3 | 101 |
| 1999 | 1.18 | 108 |
| 1998 | 1.22 | 106 |
| 1997 | 1.34 | 103 |
| 1996 | 1.42 | 95 |
| 1995 | 1.65 | 84 |
| 1994 | 1.64 | 94 |
| 1993 | 1.84 | 88 |
| 1992 | 1.9 | 80 |
| 1991 | 2.35 | 62 |
| 1990 | 2.88 | 52 |
| 1989 | 2.76 | 50 |
| 1988 | 3 | 44 |
| 1987 | 3.13 | 46 |
| 1986 | 2.5 | 56 |