Year | Value | 2021 | 420 | 2020 | 420 | 2019 | 420 | 2018 | 420 | 2017 | 410 | 2016 | 400 | 2015 | 370 | 2014 | 370 | 2013 | 350 | 2012 | 350 | 2011 | 340 | 2010 | 330 | 2009 | 340 | 2008 | 340 | 2007 | 340 | 2006 | 340 | 2005 | 340 | 2004 | 350 | 2003 | 360 | 2002 | 360 | 2001 | 360 | 2000 | 360 | 1999 | 350 | 1998 | 310 | 1997 | 270 | 1996 | 280 | 1995 | 280 | 1994 | 310 | 1993 | 300 | 1992 | 300 | 1991 | 300 | 1990 | 290 | 1989 | 300 | 1988 | 310 | 1987 | 300 | 1986 | 300 | 1985 | 300 | 1984 | 290 | 1983 | 340 | 1982 | 330 | 1981 | 370 | 1980 | 370 | 1979 | 370 | 1978 | 370 | 1977 | 370 | 1976 | 370 | 1975 | 370 | 1974 | 370 | 1973 | 370 | 1972 | 370 | 1971 | 370 | 1970 | 360 | 1969 | 360 | 1968 | 360 | 1967 | 360 | 1966 | 360 | 1965 | 360 | 1964 | 350 | 1963 | 350 | 1962 | 350 | 1961 | 350 |
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