| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.56 | 72 |
| 2015 | 2.54 | 77 |
| 2014 | 2.5 | 75 |
| 2013 | 2.46 | 78 |
| 2012 | 2.4 | 81 |
| 2011 | 2.32 | 84 |
| 2010 | 2.29 | 82 |
| 2009 | 2.27 | 85 |
| 2008 | 2.24 | 89 |
| 2007 | 2.21 | 90 |
| 2006 | 2.18 | 93 |
| 2005 | 2.14 | 97 |
| 2004 | 2.11 | 94 |
| 2003 | 1.87 | 109 |
| 2002 | 1.78 | 114 |
| 2001 | 1.66 | 121 |
| 2000 | 0.61 | 165 |
| 1999 | -.39 | 198 |
| 1998 | -.45 | 196 |
| 1997 | -.46 | 198 |
| 1996 | -.42 | 198 |
| 1995 | -.38 | 196 |
| 1994 | -.33 | 196 |
| 1993 | -.19 | 195 |
| 1992 | 0.05 | 189 |
| 1991 | 0.38 | 182 |
| 1990 | 0.77 | 167 |
| 1989 | 1.76 | 139 |
| 1988 | 2.56 | 110 |
| 1987 | 2.66 | 114 |
| 1986 | 2.61 | 116 |