| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.962 | 81 |
| 2015 | 2.451 | 78 |
| 2014 | 2.875 | 79 |
| 2013 | 3.05 | 86 |
| 2012 | 3.098 | 95 |
| 2011 | 3.202 | 96 |
| 2010 | 3.26 | 92 |
| 2009 | 3.203 | 110 |
| 2008 | 3.202 | 128 |
| 2007 | 3.258 | 131 |
| 2006 | 3.333 | 114 |
| 2005 | 3.147 | 107 |
| 2004 | 3.258 | 101 |
| 2003 | 3.659 | 96 |
| 2002 | 3.914 | 100 |
| 2001 | 3.977 | 114 |
| 2000 | 3.875 | 117 |
| 1999 | 4.379 | 118 |
| 1998 | 4.227 | 123 |
| 1997 | 4.269 | 121 |
| 1996 | 4.3 | 119 |
| 1995 | 4.202 | 121 |
| 1994 | 4.495 | 104 |
| 1993 | 4.193 | 106 |
| 1992 | 3.962 | 106 |
| 1991 | 4.175 | 105 |
| 1990 | 5 | 100 |
| 1989 | 4.708 | 99 |
| 1988 | 5.5 | 85 |
| 1987 | 5.5 | 82 |
| 1986 | 5.5 | 88 |