| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.66 | 27 |
| 2015 | 4.85 | 61 |
| 2014 | 3.75 | 73 |
| 2013 | 1.99 | 120 |
| 2012 | 2.12 | 120 |
| 2011 | 2.19 | 120 |
| 2010 | 0.4 | 169 |
| 2009 | 4.9 | 67 |
| 2008 | 0.59 | 168 |
| 2007 | 4.15 | 110 |
| 2006 | 1.35 | 153 |
| 2005 | 1.63 | 137 |
| 2004 | 3.68 | 77 |
| 2003 | 3.8 | 56 |
| 2002 | 3.66 | 67 |
| 2001 | 3.6 | 66 |
| 2000 | 3.65 | 78 |
| 1999 | 17.9 | 10 |
| 1998 | 28.52 | 3 |
| 1997 | 26.87 | 4 |
| 1996 | 30.39 | 4 |
| 1995 | 27.48 | 2 |
| 1994 | 2.13 | 51 |
| 1993 | 1.79 | 49 |
| 1992 | 0.32 | 99 |
| 1991 | 1.06 | 65 |
| 1990 | 2.86 | 27 |
| 1989 | 2.7 | 28 |
| 1988 | 4.47 | 13 |
| 1987 | 1.41 | 36 |
| 1986 | 0.65 | 52 |