| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 1.3 | 62 |
| 2015 | 1.1 | 129 |
| 2014 | 0.8 | 138 |
| 2013 | 0.8 | 149 |
| 2012 | 1.1 | 147 |
| 2011 | 0.8 | 152 |
| 2010 | 0.8 | 153 |
| 2009 | 0.6 | 155 |
| 2008 | 0.3 | 155 |
| 2007 | 0.4 | 155 |
| 2006 | 0.4 | 156 |
| 2005 | 0.4 | 154 |
| 2004 | 0.5 | 146 |
| 2003 | 1.2 | 132 |
| 2002 | 2.5 | 97 |
| 2001 | 1.7 | 112 |
| 2000 | 3.9 | 50 |
| 1999 | 6 | 23 |
| 1997 | 5.8 | 13 |
| 1996 | 7.8 | 8 |
| 1995 | 7 | 8 |
| 1994 | 8.3 | 9 |
| 1993 | 5.1 | 24 |
| 1992 | 3 | 56 |
| 1991 | 3.4 | 46 |
| 1990 | 2.6 | 62 |
| 1989 | 3.1 | 50 |
| 1988 | 3.8 | 34 |
| 1987 | 3.6 | 45 |
| 1986 | 2.8 | 60 |