| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.48 | 11 |
| 2015 | 2.53 | 12 |
| 2014 | 2.57 | 14 |
| 2013 | 2.58 | 14 |
| 2012 | 2.5 | 17 |
| 2011 | 2.38 | 23 |
| 2010 | 2.25 | 26 |
| 2009 | 2.12 | 32 |
| 2008 | 1.98 | 44 |
| 2007 | 1.83 | 49 |
| 2006 | 1.69 | 53 |
| 2005 | 1.54 | 56 |
| 2004 | 1.41 | 61 |
| 2003 | 1.22 | 69 |
| 2002 | 0.45 | 114 |
| 2001 | 0.55 | 102 |
| 2000 | 0.68 | 91 |
| 1999 | 0.82 | 92 |
| 1998 | 0.95 | 84 |
| 1997 | 1.06 | 80 |
| 1996 | 1.15 | 83 |
| 1995 | 1.23 | 78 |
| 1994 | 1.34 | 77 |
| 1993 | 1.43 | 76 |
| 1992 | 1.18 | 87 |
| 1991 | 1.46 | 73 |
| 1990 | 1.76 | 59 |
| 1989 | 2.05 | 51 |
| 1988 | 2.31 | 45 |
| 1987 | 2.51 | 38 |
| 1986 | 2.67 | 34 |