1956 -999.0 -999.0 7.0 5.5 6.4 6.2 6.7 5.8 6.4 6.4 6.4 4.9 1957 7.3 6.1 6.4 8.4 6.7 5.8 6.8 7.3 7.9 7.0 3.8 7.3 1958 6.3 6.1 6.6 5.8 6.2 4.3 7.9 6.6 5.5 6.3 6.6 8.0 1959 6.6 6.0 7.1 6.3 7.1 5.2 6.2 5.5 4.4 7.0 5.0 6.8 1960 6.4 5.6 6.1 5.8 6.2 5.9 4.4 5.3 7.7 5.4 6.8 6.7 1961 7.0 7.0 7.0 6.6 6.8 6.4 8.2 6.1 7.5 6.2 5.9 6.0 1962 5.5 5.8 5.4 6.1 5.2 4.6 6.9 7.4 6.3 7.4 6.4 6.1 1963 7.5 6.6 5.4 4.8 7.1 8.0 7.0 7.4 6.4 6.6 6.6 4.9 1964 6.3 7.0 5.0 6.3 5.3 6.0 3.6 7.0 3.9 5.8 7.0 9.2 1965 7.6 6.0 6.9 5.7 5.2 4.8 4.7 5.9 5.0 6.4 6.7 7.2 1966 6.7 6.1 7.1 7.9 6.2 6.7 8.0 5.9 6.0 7.0 6.4 6.7 1967 6.9 5.2 6.7 7.8 6.0 7.2 8.1 6.5 7.0 4.7 7.8 7.4 1968 5.7 7.7 7.2 6.2 5.6 8.4 6.8 7.8 7.8 8.2 7.2 5.1 1969 6.0 7.1 7.6 7.5 5.6 6.0 6.8 7.6 8.4 8.4 5.6 6.8 1970 8.2 7.1 6.6 6.8 6.6 6.4 6.6 7.8 8.1 6.8 7.6 7.8 1971 7.3 6.7 5.2 5.9 7.2 6.7 5.5 7.7 5.6 6.4 7.7 6.0 1972 7.2 7.3 6.8 7.6 4.0 8.0 5.8 6.6 5.0 4.7 6.1 6.4 1973 7.2 7.4 6.2 7.6 6.6 8.5 6.2 7.3 6.8 7.2 7.5 7.1 1974 8.0 7.1 7.3 6.0 7.6 7.4 7.3 7.7 7.6 8.2 7.0 6.6 1975 8.1 7.0 7.1 6.6 7.6 7.5 7.2 6.2 5.9 7.4 6.0 5.7 1976 7.8 6.6 6.2 6.6 7.3 8.7 7.3 6.3 7.9 8.7 7.4 7.1 1977 8.4 7.1 7.5 7.3 6.9 5.4 7.0 4.2 5.7 5.3 6.2 8.9 1978 6.9 6.1 6.8 6.5 6.5 7.5 5.8 7.0 5.3 5.5 6.8 8.4 1979 5.8 6.4 7.5 7.3 7.1 7.3 6.0 5.9 6.6 6.8 6.9 7.2 1980 4.8 5.9 4.7 7.4 7.4 6.4 8.7 7.3 6.8 7.8 7.9 6.6 1981 6.8 7.1 7.7 5.0 6.7 6.8 7.0 7.1 5.8 5.9 7.7 7.2 1982 6.0 7.0 6.4 6.0 7.7 5.8 7.4 4.5 6.8 6.3 5.9 5.4 1983 7.8 6.2 5.6 7.5 7.7 6.9 6.0 6.0 6.1 6.3 6.2 7.0 1984 8.1 7.3 5.6 6.9 6.1 5.7 6.0 8.0 5.1 6.5 7.2 7.0 1985 7.8 7.3 7.5 7.1 5.7 6.1 6.3 6.9 6.2 6.3 6.1 6.8 1986 5.7 7.7 7.7 8.2 6.8 6.2 6.3 6.6 7.1 7.6 6.1 6.5 1987 6.5 6.1 5.8 5.2 6.1 3.7 8.0 5.8 5.7 6.3 5.8 6.6 1988 7.0 5.9 7.7 5.5 7.8 6.3 6.1 6.3 6.6 6.9 6.5 6.2 1989 6.8 6.5 6.8 6.8 7.3 7.9 7.0 7.3 7.4 7.9 5.7 8.4 1990 6.8 6.8 8.0 7.6 7.9 7.8 7.3 7.6 8.4 -999.0 6.4 7.5 1991 6.9 7.4 7.2 7.2 6.7 7.1 6.8 6.6 5.2 6.7 7.3 5.3 1992 8.0 7.8 7.1 7.0 5.5 7.3 5.5 8.1 6.1 7.4 6.1 5.4 1993 5.8 7.1 6.5 5.7 6.4 5.4 6.4 7.1 7.4 5.9 5.0 5.7 1994 6.4 6.1 6.3 4.2 6.5 7.2 5.2 5.6 7.7 6.3 4.7 6.7 1995 6.5 6.3 6.7 5.7 5.5 6.7 8.4 8.0 6.7 6.8 7.1 7.8 1996 6.9 7.0 7.4 7.5 6.5 7.8 8.2 6.9 6.8 7.1 7.1 7.0 1997 6.5 7.9 7.5 5.5 8.3 8.1 8.4 7.0 8.1 6.7 7.1 6.9 1998 7.5 5.3 6.6 7.8 6.3 7.6 6.3 8.7 5.7 5.9 9.0 7.4 1999 6.3 5.7 7.0 7.1 6.6 7.6 7.7 8.1 7.0 7.8 5.7 7.9 2000 7.1 6.4 5.9 6.4 5.2 4.5 6.7 7.2 6.8 5.5 8.0 5.6 2001 6.8 6.3 6.2 6.9 8.1 7.1 7.5 7.3 6.3 5.8 8.1 6.7 2002 6.8 7.4 7.5 8.4 6.8 7.7 7.6 6.8 6.9 6.4 6.2 5.5 2003 6.3 8.0 7.7 7.0 6.8 6.6 5.0 6.5 7.1 7.6 6.6 6.7 2004 7.4 5.6 6.6 6.9 8.1 6.3 5.6 7.4 6.6 7.3 7.1 6.7 2005 8.2 6.4 7.3 7.0 6.7 6.3 5.8 7.5 7.5 4.9 5.6 7.6 2006 5.9 4.6 6.6 8.4 3.9 7.0 7.5 6.6 5.7 5.5 6.8 6.9 2007 6.5 7.1 7.7 7.1 7.6 5.7 8.6 8.1 8.3 6.0 7.6 6.4 2008 5.9 7.4 6.8 6.5 7.0 7.2 7.9 6.6 5.2 6.9 7.7 6.4 2009 5.3 7.0 6.2 6.7 9.2 6.8 8.4 7.8 7.5 6.7 7.2 6.7 2010 7.3 6.7 6.7 6.9 8.1 8.4 7.0 7.2 8.4 6.8 5.1 8.5 2011 7.5 6.5 7.9 6.9 6.5 5.5 7.5 7.2 6.7 5.8 3.5 6.7 2012 6.9 4.4 6.6 6.3 4.5 6.8 5.1 5.3 6.8 7.0 5.0 5.5 2013 6.9 6.2 7.0 6.2 7.4 7.9 7.9 7.2 8.1 5.0 6.4 6.0 2014 7.0 7.1 5.5 6.4 7.4 7.7 7.2 7.0 8.1 7.0 8.6 6.6 2015 6.0 6.9 5.7 6.2 6.5 6.8 6.8 7.3 7.9 5.1 7.2 6.5 2016 6.1 6.3 5.8 7.1 6.8 5.9 6.9 7.5 5.3 6.0 6.9 7.8 2017 6.1 6.6 6.8 7.1 5.9 4.7 6.9 8.1 5.3 7.0 5.4 5.0 2018 6.0 7.2 5.7 5.9 7.8 6.6 7.1 6.0 5.9 6.0 6.0 5.1 2019 5.7 7.0 5.4 6.2 6.1 6.5 7.8 7.5 6.8 5.2 6.4 4.6 2020 6.2 6.2 7.3 6.7 4.2 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 2021 5.3 6.7 7.6 5.8 5.9 5.7 6.5 7.6 6.9 6.9 5.1 7.6 2022 6.2 6.7 6.6 6.8 6.6 6.6 5.9 6.5 6.4 7.6 5.7 6.4 2023 6.7 6.7 5.8 7.0 5.4 5.7 5.1 4.5 7.2 7.0 7.1 5.4