| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.41 | 73 |
| 2015 | 1.53 | 70 |
| 2014 | 1.46 | 79 |
| 2013 | 1.52 | 73 |
| 2012 | 1.43 | 73 |
| 2011 | 1.57 | 63 |
| 2010 | 1.51 | 74 |
| 2009 | 1.96 | 55 |
| 2008 | 1.91 | 55 |
| 2007 | 2.05 | 51 |
| 2006 | 2.01 | 52 |
| 2005 | 2.17 | 51 |
| 2004 | 2.26 | 50 |
| 2003 | 2.61 | 41 |
| 2002 | 2.22 | 56 |
| 2001 | 2.08 | 57 |
| 2000 | 1.63 | 76 |
| 1999 | 2.1 | 56 |
| 1998 | 1.61 | 81 |
| 1997 | 2.09 | 59 |
| 1996 | 2.4 | 49 |
| 1995 | 2.75 | 42 |
| 1994 | 2.85 | 42 |
| 1993 | 2.88 | 44 |
| 1992 | 2.99 | 40 |
| 1991 | 3.2 | 38 |
| 1990 | 2.56 | 59 |
| 1989 | 2.62 | 53 |
| 1988 | 2.43 | 58 |
| 1987 | 4.15 | 29 |
| 1986 | 3.22 | 41 |