| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 0 | 135 |
| 2015 | 0.1 | 135 |
| 2014 | 0.1 | 139 |
| 2013 | 0.1 | 138 |
| 2012 | 0.1 | 139 |
| 2011 | 0.1 | 139 |
| 2010 | 0.1 | 131 |
| 2009 | 0 | 138 |
| 2006 | 0 | 135 |
| 2005 | 0 | 136 |
| 2004 | 0 | 145 |
| 2003 | 0 | 149 |
| 2002 | 0 | 145 |
| 2001 | 7.4 | 110 |
| 2000 | 12.3 | 105 |
| 1999 | 13.7 | 96 |
| 1998 | 13.5 | 99 |
| 1997 | 15.3 | 104 |
| 1996 | 16.5 | 92 |
| 1995 | 15.3 | 96 |
| 1994 | 14.5 | 94 |
| 1993 | 14.3 | 92 |
| 1992 | 15.2 | 92 |
| 1991 | 16.1 | 83 |
| 1990 | 17.7 | 78 |
| 1989 | 18 | 84 |
| 1988 | 15.9 | 84 |
| 1987 | 16.3 | 85 |
| 1986 | 16.5 | 79 |