| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.852 | 87 |
| 2015 | 5.084 | 119 |
| 2014 | 4.952 | 133 |
| 2013 | 5.167 | 132 |
| 2012 | 3.988 | 146 |
| 2011 | 3.678 | 146 |
| 2010 | 3.87 | 149 |
| 2009 | 4.963 | 145 |
| 2008 | 5.97 | 133 |
| 2007 | 5.959 | 147 |
| 2006 | 5.4 | 149 |
| 2005 | 5.162 | 145 |
| 2004 | 5.121 | 146 |
| 2003 | 5.532 | 136 |
| 2002 | 9.698 | 101 |
| 2001 | 10.009 | 103 |
| 2000 | 9.63 | 113 |
| 1999 | 8.809 | 119 |
| 1998 | 9.015 | 118 |
| 1997 | 9.129 | 117 |
| 1996 | 10.018 | 109 |
| 1995 | 10.944 | 101 |
| 1994 | 11.476 | 82 |
| 1993 | 12.85 | 75 |
| 1992 | 13.594 | 67 |
| 1991 | 12.463 | 67 |
| 1990 | 11.593 | 73 |
| 1989 | 9.936 | 87 |
| 1988 | 8.328 | 92 |
| 1987 | 8.359 | 90 |
| 1986 | 8.748 | 87 |