| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.647 | 129 |
| 2015 | 2.681 | 143 |
| 2014 | 2.69 | 148 |
| 2013 | 2.689 | 149 |
| 2012 | 2.688 | 150 |
| 2011 | 2.718 | 149 |
| 2010 | 2.733 | 152 |
| 2009 | 2.751 | 153 |
| 2008 | 3.343 | 157 |
| 2007 | 3.15 | 164 |
| 2006 | 3.032 | 165 |
| 2005 | 3.119 | 162 |
| 2004 | 3.195 | 154 |
| 2003 | 3.269 | 151 |
| 2002 | 3.932 | 150 |
| 2001 | 4.302 | 148 |
| 2000 | 4.285 | 148 |
| 1999 | 3.9 | 148 |
| 1998 | 4.067 | 144 |
| 1997 | 4.466 | 139 |
| 1996 | 4.973 | 137 |
| 1995 | 5.478 | 132 |
| 1994 | 5.505 | 125 |
| 1993 | 6.403 | 117 |
| 1992 | 7.801 | 105 |
| 1991 | 7.826 | 103 |
| 1990 | 7.423 | 100 |
| 1989 | 5.849 | 105 |
| 1988 | 5.073 | 104 |
| 1987 | 5.235 | 103 |
| 1986 | 5.46 | 101 |