| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.963 | 80 |
| 2015 | 2.466 | 77 |
| 2014 | 2.893 | 78 |
| 2013 | 3.044 | 87 |
| 2012 | 3.16 | 93 |
| 2011 | 3.375 | 87 |
| 2010 | 3.37 | 88 |
| 2009 | 3.484 | 95 |
| 2008 | 3.537 | 120 |
| 2007 | 3.524 | 127 |
| 2006 | 3.835 | 104 |
| 2005 | 3.858 | 87 |
| 2004 | 4.122 | 80 |
| 2003 | 4.857 | 78 |
| 2002 | 4.364 | 93 |
| 2001 | 4.489 | 104 |
| 2000 | 5.177 | 93 |
| 1999 | 4.45 | 116 |
| 1998 | 4.344 | 121 |
| 1997 | 4.356 | 118 |
| 1996 | 4.331 | 118 |
| 1995 | 4.022 | 125 |
| 1994 | 4.188 | 110 |
| 1993 | 5.008 | 96 |
| 1992 | 5.753 | 90 |
| 1991 | 5.995 | 90 |
| 1990 | 9 | 54 |
| 1989 | 7.5 | 70 |
| 1988 | 7 | 66 |
| 1987 | 7.646 | 54 |
| 1986 | 7.958 | 59 |