| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.45 | 79 |
| 2015 | 2.5 | 78 |
| 2014 | 2.53 | 74 |
| 2013 | 2.52 | 75 |
| 2012 | 2.44 | 80 |
| 2011 | 2.32 | 83 |
| 2010 | 2.18 | 93 |
| 2009 | 2.04 | 98 |
| 2008 | 1.91 | 107 |
| 2007 | 1.79 | 110 |
| 2006 | 1.69 | 119 |
| 2005 | 1.59 | 121 |
| 2004 | 1.5 | 123 |
| 2003 | 1.47 | 125 |
| 2002 | 1.49 | 128 |
| 2001 | 1.54 | 127 |
| 2000 | 1.6 | 122 |
| 1999 | 1.68 | 112 |
| 1998 | 1.83 | 108 |
| 1997 | 2.06 | 102 |
| 1996 | 2.37 | 93 |
| 1995 | 2.36 | 96 |
| 1994 | 2.38 | 100 |
| 1993 | 2.62 | 94 |
| 1992 | 2.69 | 91 |
| 1991 | 2.63 | 103 |
| 1990 | 2.51 | 108 |
| 1989 | 2.25 | 119 |
| 1988 | 2.02 | 132 |
| 1987 | 1.98 | 136 |
| 1986 | 1.97 | 134 |