| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.59 | 70 |
| 2015 | 2.76 | 66 |
| 2014 | 2.94 | 61 |
| 2013 | 3.11 | 60 |
| 2012 | 3.26 | 54 |
| 2011 | 3.41 | 52 |
| 2010 | 3.57 | 50 |
| 2009 | 3.65 | 43 |
| 2008 | 3.75 | 42 |
| 2007 | 3.86 | 42 |
| 2006 | 3.97 | 41 |
| 2005 | 4.08 | 34 |
| 2004 | 4.2 | 34 |
| 2003 | 4.32 | 30 |
| 2002 | 4.47 | 26 |
| 2001 | 4.62 | 20 |
| 2000 | 2.39 | 88 |
| 1999 | 1.71 | 110 |
| 1998 | 1.76 | 111 |
| 1997 | 1.74 | 115 |
| 1996 | 1.67 | 117 |
| 1995 | 1.56 | 126 |
| 1994 | 1.49 | 128 |
| 1993 | 1.48 | 130 |
| 1992 | 1.58 | 126 |
| 1991 | 1.76 | 129 |
| 1990 | 2.28 | 114 |
| 1989 | 2.52 | 112 |
| 1988 | 2.68 | 106 |
| 1987 | 2.75 | 110 |
| 1986 | 2.76 | 108 |