| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.32 | 78 |
| 2015 | 1.36 | 81 |
| 2014 | 1.33 | 87 |
| 2013 | 1.33 | 87 |
| 2012 | 1.38 | 81 |
| 2011 | 1.41 | 75 |
| 2010 | 1.54 | 71 |
| 2009 | 1.54 | 76 |
| 2008 | 1.44 | 88 |
| 2007 | 1.47 | 82 |
| 2006 | 1.48 | 85 |
| 2005 | 1.52 | 84 |
| 2004 | 1.46 | 88 |
| 2003 | 1.5 | 89 |
| 2002 | 1.9 | 69 |
| 2001 | 1.95 | 61 |
| 2000 | 1.73 | 71 |
| 1999 | 1.65 | 73 |
| 1998 | 1.66 | 78 |
| 1997 | 1.58 | 85 |
| 1996 | 1.65 | 78 |
| 1995 | 1.82 | 72 |
| 1994 | 1.97 | 71 |
| 1993 | 1.93 | 80 |
| 1992 | 1.52 | 98 |
| 1991 | 1.95 | 83 |
| 1990 | 2.36 | 63 |
| 1989 | 2.52 | 56 |
| 1988 | 2.12 | 76 |
| 1987 | 1.75 | 85 |
| 1986 | 1.22 | 91 |