1958 78.0 74.0 74.0 73.0 74.0 73.0 73.0 71.0 72.0 73.0 75.0 76.0 1959 77.0 79.0 78.0 75.0 74.0 73.0 73.0 73.0 73.0 76.0 78.0 78.0 1960 78.0 78.0 74.0 73.0 74.0 73.0 74.0 73.0 74.0 76.0 76.0 80.0 1961 78.0 79.0 77.0 75.0 75.0 76.0 75.0 75.0 75.0 77.0 78.0 78.0 1962 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 1963 -999.0 53.0 51.0 49.0 50.0 51.0 52.0 52.0 53.0 52.0 53.0 70.0 1964 76.0 73.0 70.0 61.0 65.0 67.0 66.0 64.0 65.0 68.0 70.0 71.0 1965 72.0 74.0 73.0 72.0 70.0 70.0 70.0 72.0 72.0 75.0 76.0 77.0 1966 76.0 76.0 72.0 69.0 69.0 69.0 69.0 69.0 69.0 72.0 74.0 75.0 1967 72.0 68.0 69.0 66.0 66.0 66.0 66.0 65.0 68.0 71.0 74.0 73.0 1968 70.0 69.0 66.0 66.0 67.0 67.0 66.0 66.0 66.0 70.0 71.0 70.0 1969 65.0 65.0 62.0 62.0 61.0 62.0 61.0 61.0 61.0 63.0 64.0 66.0 1970 61.0 60.0 58.0 56.0 56.0 64.0 64.0 64.0 64.0 66.0 66.0 67.0 1971 72.0 71.0 67.0 66.0 66.0 68.0 67.0 68.0 68.0 70.0 70.0 72.0 1972 74.0 71.0 70.0 69.0 68.0 68.0 68.0 70.0 70.0 70.0 70.0 70.0 1973 71.0 78.0 75.0 76.0 74.0 74.0 74.0 73.0 74.0 75.0 77.0 72.0 1974 74.0 70.0 68.0 67.0 67.0 68.0 68.0 67.0 67.0 70.0 72.0 73.0 1975 76.0 80.0 80.0 80.0 81.0 80.0 79.0 79.0 80.0 82.0 82.0 82.0 1976 83.0 81.0 75.0 72.0 72.0 72.0 72.0 72.0 72.0 72.0 72.0 72.0 1977 71.0 65.0 64.0 64.0 65.0 64.0 63.0 64.0 63.0 65.0 66.0 64.0 1978 64.0 65.0 63.0 63.0 63.0 63.0 64.0 62.0 63.0 64.0 -999.0 -999.0 1979 71.0 68.0 65.0 65.0 64.0 64.0 64.0 64.0 64.0 65.0 68.0 67.0 1980 67.0 65.0 65.0 69.0 73.0 75.0 75.0 75.0 75.0 75.0 75.0 79.0 1981 81.0 77.0 68.0 66.0 67.0 67.0 68.0 69.0 71.0 72.0 72.0 75.0 1982 74.0 70.0 66.0 64.0 64.0 64.0 65.0 64.0 64.0 68.0 71.0 71.0 1983 72.0 71.0 68.0 68.0 68.0 69.0 67.0 67.0 69.0 69.0 70.0 71.0 1984 72.0 71.0 70.0 65.0 67.0 66.0 68.0 68.0 70.0 68.0 69.0 71.0 1985 72.0 70.0 67.0 66.0 64.0 64.0 63.0 65.0 67.0 67.0 71.0 73.0 1986 77.0 73.0 66.0 66.0 65.0 65.0 66.0 66.0 66.0 66.0 68.0 69.0 1987 72.0 71.0 69.0 68.0 67.0 68.0 68.0 67.0 68.0 68.0 69.0 72.0 1988 72.0 71.0 69.0 68.0 69.0 69.0 68.0 69.0 69.0 70.0 72.0 72.0 1989 72.0 70.0 66.0 66.0 66.0 67.0 70.0 68.0 67.0 69.0 69.0 66.0 1990 66.0 65.0 66.0 66.0 66.0 66.0 67.0 66.0 68.0 70.0 71.0 73.0 1991 73.0 73.0 72.0 70.0 68.0 67.0 66.0 66.0 66.0 69.0 71.0 72.0 1992 71.0 70.0 69.0 69.0 69.0 69.0 68.0 69.0 69.0 70.0 71.0 72.0 1993 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 1994 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 1995 75.0 75.0 74.0 73.0 72.0 72.0 77.0 73.0 73.0 75.0 76.0 78.0 1996 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 1997 78.0 74.0 73.0 71.0 63.0 63.0 61.0 62.0 64.0 66.0 76.0 78.0 1998 76.0 72.0 72.0 72.0 72.0 75.0 72.0 70.0 69.0 78.0 78.0 67.0 1999 72.0 71.0 70.0 69.0 68.0 69.0 68.0 69.0 69.0 70.0 72.0 75.0 2000 76.0 78.0 51.0 38.0 47.0 69.0 63.0 64.0 59.0 46.0 51.0 62.0 2001 65.0 65.0 60.0 47.0 49.0 55.0 52.0 66.0 69.0 70.0 66.0 56.0 2002 56.0 52.0 55.0 54.0 54.0 54.0 54.0 54.0 54.0 56.0 59.0 65.0 2003 65.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 2004 -999.0 -999.0 63.0 60.0 56.0 55.0 55.0 56.0 55.0 55.0 59.0 75.0 2005 65.0 61.0 61.0 64.0 67.0 68.0 71.0 70.0 72.0 77.0 75.0 77.0 2006 80.0 79.0 65.0 58.0 57.0 56.0 55.0 56.0 57.0 55.0 55.0 59.0 2007 63.0 56.0 60.0 60.0 61.0 65.0 66.0 64.0 63.0 65.0 66.0 65.0 2008 61.0 60.0 61.0 60.0 60.0 59.0 61.0 60.0 60.0 60.0 60.0 58.0 2009 58.0 58.0 56.0 58.0 58.0 58.0 58.0 58.0 58.0 59.0 58.0 58.0 2010 58.0 57.0 59.0 57.0 58.0 57.0 58.0 58.0 58.0 59.0 58.0 58.0 2011 56.0 59.0 60.0 60.0 56.0 58.0 61.0 61.0 60.0 60.0 57.0 57.0 2012 59.0 58.0 59.0 -999.0 -999.0 58.0 57.0 57.0 59.0 58.0 59.0 57.0 2013 56.0 54.0 54.0 56.0 56.0 57.0 56.0 56.0 57.0 56.0 58.0 55.0 2014 57.0 57.0 57.0 55.0 53.0 52.0 52.0 50.0 49.0 51.0 53.0 59.0 2015 57.0 56.0 56.0 56.0 55.0 54.0 53.0 50.0 51.0 55.0 55.0 57.0 2016 57.0 57.0 55.0 56.0 55.0 55.0 55.0 55.0 55.0 55.0 56.0 57.0 2017 57.0 57.0 57.0 56.0 56.0 55.0 56.0 56.0 51.0 50.0 51.0 55.0 2018 58.0 56.0 55.0 57.0 57.0 58.0 55.0 56.0 54.0 55.0 53.0 57.0 2019 56.0 56.0 55.0 55.0 54.0 55.0 56.0 55.0 55.0 54.0 53.0 56.0 2020 56.0 56.0 59.0 57.0 56.0 57.0 59.0 57.0 59.0 58.0 59.0 60.0 2021 60.0 56.0 53.0 53.0 54.0 55.0 56.0 57.0 57.0 57.0 58.0 59.0 2022 61.0 54.0 50.0 57.0 59.0 59.0 58.0 58.0 54.0 55.0 53.0 56.0 2023 55.0 56.0 55.0 55.0 54.0 55.0 55.0 53.0 56.0 58.0 59.0 61.0