| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.64 | 66 |
| 2015 | 2.77 | 65 |
| 2014 | 2.89 | 63 |
| 2013 | 2.96 | 63 |
| 2012 | 2.97 | 65 |
| 2011 | 2.93 | 68 |
| 2010 | 2.87 | 74 |
| 2009 | 2.81 | 72 |
| 2008 | 2.76 | 74 |
| 2007 | 2.7 | 76 |
| 2006 | 2.65 | 79 |
| 2005 | 2.6 | 80 |
| 2004 | 2.55 | 79 |
| 2003 | 2.53 | 78 |
| 2002 | 2.56 | 82 |
| 2001 | 2.62 | 84 |
| 2000 | 2.7 | 76 |
| 1999 | 2.78 | 74 |
| 1998 | 2.82 | 77 |
| 1997 | 2.95 | 71 |
| 1996 | 3.12 | 71 |
| 1995 | 3.29 | 64 |
| 1994 | 3.47 | 60 |
| 1993 | 3.65 | 57 |
| 1992 | 3.81 | 56 |
| 1991 | 3.95 | 61 |
| 1990 | 4.08 | 59 |
| 1989 | 4.22 | 57 |
| 1988 | 4.35 | 59 |
| 1987 | 4.62 | 54 |
| 1986 | 4.79 | 51 |