ROK A B C D 1951 6.0 7.3 5.2 6.5 1952 6.1 7.4 4.5 6.1 1953 7.1 8.4 6.1 5.9 1954 9.8 11.1 8.9 7.9 1955 7.6 8.9 6.6 5.7 1956 5.4 6.8 4.7 5.2 1957 7.9 9.2 7.1 7.5 1958 7.4 8.7 6.2 6.7 1959 6.1 7.5 4.9 6.0 1960 6.7 8.1 5.5 5.8 1961 5.2 6.5 3.8 5.9 1962 6.8 8.1 5.7 6.4 1963 6.7 8.1 5.5 6.9 1964 3.8 5.2 2.2 4.2 1965 4.5 5.8 2.8 5.5 1966 9.8 11.1 8.7 8.5 1967 6.6 8.0 5.8 7.0 1968 8.9 10.3 7.7 6.8 1969 7.7 9.1 6.2 7.6 1970 6.5 7.8 5.7 6.4 1971 6.1 7.4 5.2 6.1 1972 6.4 7.6 4.8 5.9 1973 6.3 7.6 4.7 6.1 1974 10.8 12.2 9.9 7.7 1975 6.4 7.8 5.3 6.1 1976 6.5 7.7 5.3 6.7 1977 3.4 4.7 1.7 4.3 1978 6.8 8.2 5.7 5.2 1979 8.6 9.9 7.5 7.1 1980 8.3 9.6 6.6 7.3 1981 6.0 7.4 4.7 5.9 1982 3.9 5.3 2.7 4.9 1983 6.7 8.0 5.3 6.4 1984 5.0 6.3 3.6 4.9 1985 6.9 8.3 5.9 6.0 1986 6.2 7.7 4.7 6.5 1987 3.9 5.2 2.9 5.7 1988 7.2 8.5 5.7 5.8 1989 6.6 8.0 4.9 5.4 1990 6.1 7.4 4.5 5.2 1991 10.0 11.4 8.6 8.2 1992 6.7 8.1 5.0 5.2 1993 5.1 6.4 4.1 5.2 1994 5.2 6.6 4.3 6.2 1995 6.2 7.5 5.3 5.2 1996 7.8 9.1 6.9 6.9 1997 8.6 9.8 7.3 7.7 1998 7.9 9.2 6.6 5.8 1999 7.1 8.4 6.1 7.1 2000 7.7 9.0 6.4 7.6 2001 7.7 9.0 6.8 6.5 2002 6.6 8.0 5.8 5.3 2003 6.0 7.3 4.3 5.2 2004 8.4 9.8 7.6 7.1 2005 7.0 8.3 5.3 6.2 2006 5.8 7.2 4.7 6.6 2007 4.4 5.7 2.9 5.4 2008 6.3 7.6 5.2 6.8 2009 7.1 8.4 5.8 5.9 2010 8.1 9.4 6.7 6.3 2011 6.3 7.7 4.8 5.1 2012 4.9 6.2 3.2 4.4 2013 4.2 5.5 3.4 5.6 2014 6.3 7.7 5.8 6.6 2015 8.2 9.6 7.2 6.0 2016 10.1 11.4 9.4 8.4 2017 8.4 9.7 7.3 7.5 2018 2.6 4.0 2.1 3.7 2019 6.9 8.1 6.2 7.0 2020 7.1 8.3 6.8 6.4 2021 7.5 8.8 6.9 7.5 2022 7.9 9.2 7.7 6.7 2023 7.7 9.0 6.9 6.5 2024 6.8 8.2 6.2 6.5 2025 8.7 10.0 7.5 6.7 2026 5.4 6.7 4.5 6.0 2027 8.3 9.7 7.4 6.1 2028 4.9 6.3 4.4 6.1 2029 6.5 7.9 5.8 6.7 2030 6.6 7.9 6.0 6.1 2031 6.1 7.5 5.4 6.6 2032 8.4 9.8 8.0 6.6 2033 9.1 10.4 8.3 8.1 2034 8.8 10.1 8.4 7.3 2035 6.3 7.7 5.9 6.8 2036 7.2 8.5 6.6 7.0 2037 5.7 7.1 5.5 4.9 2038 8.0 9.4 7.6 6.9 2039 11.3 12.6 10.3 7.6 2040 7.7 9.2 6.6 7.4 2041 7.5 8.8 7.0 5.6 2042 6.6 7.9 6.3 5.5 2043 8.3 9.7 7.4 6.7 2044 6.0 7.4 5.4 6.3 2045 4.0 5.4 3.1 5.6 2046 7.6 8.9 7.0 7.5 2047 8.9 10.3 8.8 7.7 2048 7.6 8.9 7.1 6.4 2049 6.6 7.9 6.3 7.0 2050 5.5 6.9 4.6 5.1