| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.44 | 69 |
| 2015 | 1.32 | 85 |
| 2014 | 1.47 | 74 |
| 2013 | 1.61 | 63 |
| 2012 | 1.5 | 70 |
| 2011 | 1.44 | 74 |
| 2010 | 1.77 | 60 |
| 2009 | 1.86 | 57 |
| 2008 | 1.9 | 56 |
| 2007 | 2.31 | 42 |
| 2006 | 2.19 | 48 |
| 2005 | 2.35 | 44 |
| 2004 | 2.49 | 44 |
| 2003 | 2.7 | 38 |
| 2002 | 2.79 | 37 |
| 2001 | 2.87 | 39 |
| 2000 | 2.67 | 43 |
| 1999 | 2.65 | 44 |
| 1998 | 2.19 | 56 |
| 1997 | 2.18 | 57 |
| 1996 | 2.11 | 60 |
| 1995 | 2.38 | 51 |
| 1994 | 2.49 | 53 |
| 1993 | 2.61 | 54 |
| 1992 | 2.97 | 41 |
| 1991 | 3.04 | 44 |
| 1990 | 3.83 | 30 |
| 1989 | 4.4 | 25 |