| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.72 | 54 |
| 2015 | 1.58 | 67 |
| 2014 | 1.57 | 70 |
| 2013 | 1.6 | 67 |
| 2012 | 1.39 | 79 |
| 2011 | 1.6 | 61 |
| 2010 | 1.52 | 73 |
| 2009 | 1.68 | 70 |
| 2008 | 1.62 | 71 |
| 2007 | 1.71 | 66 |
| 2006 | 1.59 | 78 |
| 2005 | 1.43 | 93 |
| 2004 | 1.34 | 107 |
| 2003 | 1.41 | 99 |
| 2002 | 1.39 | 96 |
| 2001 | 1.41 | 95 |
| 2000 | 1.33 | 98 |
| 1999 | 1.52 | 83 |
| 1998 | 1.49 | 86 |
| 1997 | 1.52 | 89 |
| 1996 | 1.57 | 82 |
| 1995 | 1.66 | 82 |
| 1994 | 1.71 | 89 |
| 1993 | 2.11 | 71 |
| 1992 | 1.83 | 86 |
| 1991 | 1.96 | 82 |
| 1990 | 2.07 | 76 |
| 1989 | 2.03 | 76 |
| 1988 | 2.11 | 77 |
| 1987 | 1.98 | 77 |
| 1986 | 2.04 | 70 |