| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.53 | 62 |
| 2015 | 1.75 | 58 |
| 2014 | 1.63 | 66 |
| 2013 | 1.36 | 85 |
| 2012 | 1.36 | 82 |
| 2011 | 1.32 | 79 |
| 2010 | 1.38 | 81 |
| 2009 | 1.44 | 83 |
| 2008 | 1.55 | 76 |
| 2007 | 1.65 | 69 |
| 2006 | 1.61 | 76 |
| 2005 | 1.67 | 76 |
| 2004 | 1.58 | 84 |
| 1999 | 1.65 | 72 |
| 1997 | 1.01 | 118 |
| 1996 | 1.05 | 114 |
| 1995 | 1.45 | 97 |
| 1994 | 1.72 | 88 |
| 1993 | 1.56 | 100 |
| 1992 | 2.96 | 42 |
| 1991 | 2.55 | 57 |
| 1990 | 3.72 | 33 |
| 1989 | 4.2 | 29 |
| 1988 | 2.33 | 65 |
| 1987 | 2.95 | 49 |
| 1986 | 3.7 | 34 |