| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.28 | 55 |
| 2015 | 3.92 | 54 |
| 2014 | 4.06 | 63 |
| 2013 | 3.81 | 72 |
| 2012 | 4.48 | 54 |
| 2011 | 4.17 | 80 |
| 2010 | 4.25 | 58 |
| 2009 | 4 | 54 |
| 2008 | 5.18 | 70 |
| 2007 | 3.51 | 74 |
| 2006 | 4.74 | 57 |
| 2005 | 5.07 | 50 |
| 2004 | 6.12 | 51 |
| 2003 | 2.38 | 92 |
| 2002 | 2.69 | 83 |
| 2001 | 2.65 | 79 |
| 2000 | 2.3 | 83 |
| 1999 | 2.75 | 84 |
| 1998 | 3.43 | 66 |
| 1997 | 3.43 | 61 |
| 1996 | 5.06 | 48 |
| 1995 | 4.91 | 48 |
| 1994 | 3.98 | 43 |
| 1993 | 4.65 | 35 |
| 1992 | 4.61 | 43 |
| 1991 | 2.36 | 59 |
| 1990 | 7.38 | 28 |
| 1989 | 3.08 | 57 |
| 1988 | 2.5 | 65 |
| 1987 | 4.74 | 35 |
| 1986 | 3.28 | 49 |