| 1976 | 42,12 |
| 1977 | 39,06 |
| 1978 | 42,74 |
| 1979 | 38,74 |
| 1980 | |
| 1981 | 40,79 |
| 1982 | 41,00 |
| 1983 | 48,73 |
| 1984 | 48,30 |
| 1985 | 42,01 |
| 1986 | 26,41 |
| 1987 | 38,71 |
| 1988 | 43,57 |
| 1989 | 41,36 |
| 1990 | 41,92 |
| 1991 | |
| 1992 | 42,09 |
| 1993 | 42,98 |
| 1994 | |
| 1995 | 35,08 |
| 1996 | 34,73 |
| 1997 | 35,18 |
| 1998 | 33,97 |
| 1999 | 35,26 |
| 2000 | |
| 2001 | 35,09 |
| 2002 | 34,38 |
| 2003 | 35,75 |
| 2004 | 33,71 |
| 2005 | 30,83 |
| 2006 | 26,75 |
| 2007 | 25,36 |
| 2008 | 22,60 |
| 2009 | 21,41 |
| 2010 | |
| 2011 | 18,42 |
| 2012 | 15,93 |
| 2013 | 15,09 |
| 2014 | 13,29 |
  
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