| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.544 | 113 |
| 2015 | 4.585 | 125 |
| 2014 | 4.587 | 139 |
| 2013 | 4.613 | 142 |
| 2012 | 4.786 | 142 |
| 2011 | 4.915 | 142 |
| 2010 | 5 | 143 |
| 2009 | 5.084 | 142 |
| 2008 | 6.08 | 131 |
| 2007 | 6.409 | 141 |
| 2006 | 6.486 | 135 |
| 2005 | 5.953 | 134 |
| 2004 | 6.046 | 130 |
| 2003 | 6.301 | 125 |
| 2002 | 6.528 | 133 |
| 2001 | 7.127 | 130 |
| 2000 | 7.673 | 129 |
| 1999 | 8.563 | 122 |
| 1998 | 12.134 | 98 |
| 1997 | 10.628 | 105 |
| 1996 | 9.943 | 112 |
| 1995 | 8.73 | 117 |
| 1994 | 8.764 | 108 |
| 1993 | 10.031 | 95 |
| 1992 | 10.162 | 87 |
| 1991 | 9.348 | 92 |
| 1990 | 8.786 | 95 |
| 1989 | 8.896 | 95 |
| 1988 | 9.3 | 83 |
| 1987 | 10.363 | 70 |