| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.44 | 111 |
| 2015 | 2.32 | 134 |
| 2014 | 2.43 | 133 |
| 2013 | 2.33 | 140 |
| 2012 | 2.41 | 137 |
| 2011 | 2.54 | 134 |
| 2010 | 2.63 | 136 |
| 2009 | 2.99 | 130 |
| 2008 | 3.17 | 129 |
| 2007 | 2.96 | 133 |
| 2006 | 2.61 | 139 |
| 2005 | 2.67 | 138 |
| 2004 | 3.06 | 137 |
| 2003 | 3.35 | 135 |
| 2002 | 3.71 | 132 |
| 2001 | 3.53 | 134 |
| 2000 | 3.29 | 138 |
| 1999 | 3.56 | 128 |
| 1998 | 3.78 | 129 |
| 1997 | 4.03 | 128 |
| 1996 | 4.21 | 127 |
| 1995 | 3.86 | 133 |
| 1994 | 4.6 | 115 |
| 1993 | 4.17 | 114 |
| 1992 | 3.8 | 113 |
| 1991 | 4.55 | 107 |
| 1990 | 4.62 | 106 |
| 1989 | 5.4 | 95 |
| 1988 | 5.82 | 96 |
| 1987 | 5.58 | 95 |
| 1986 | 4.96 | 90 |