| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 6 | 91 |
| 2015 | 9.3 | 86 |
| 2014 | 11.8 | 87 |
| 2013 | 13.5 | 83 |
| 2012 | 15.7 | 78 |
| 2011 | 16.9 | 79 |
| 2010 | 15.7 | 78 |
| 2009 | 9.1 | 86 |
| 2008 | 10.6 | 89 |
| 2007 | 10.2 | 89 |
| 2006 | 10 | 90 |
| 2005 | 10.4 | 88 |
| 2004 | 10.2 | 94 |
| 2003 | 9.7 | 97 |
| 2002 | 12.5 | 93 |
| 2001 | 22.9 | 84 |
| 2000 | 79 | 60 |
| 1999 | 84.8 | 59 |
| 1998 | 90.5 | 61 |
| 1997 | 54.5 | 63 |
| 1996 | 44.9 | 66 |
| 1995 | 43.8 | 65 |
| 1994 | 43.4 | 62 |
| 1993 | 37.9 | 62 |
| 1992 | 36.2 | 62 |
| 1991 | 36.1 | 60 |
| 1990 | 38.7 | 62 |
| 1989 | 32.7 | 63 |
| 1988 | 33.1 | 62 |
| 1987 | 30 | 62 |
| 1986 | 24.8 | 63 |