Line 1, .
Point 1, 1960 is 2.7.
Point 2, 1961 is 3.
Point 3, 1962 is 3.4.
Point 4, 1963 is 3.9.
Point 5, 1964 is 4.4.
Point 6, 1965 is 4.6.
Point 7, 1966 is 5.3.
Point 8, 1967 is 6.
Point 9, 1968 is 6.8.
Point 10, 1969 is 7.
Point 11, 1970 is 7.5.
Point 12, 1971 is 8.1.
Point 13, 1972 is 8.
Point 14, 1973 is 8.3.
Point 15, 1974 is 9.2.
Point 16, 1975 is 8.6.
Point 17, 1976 is 10.4.
Point 18, 1977 is 10.6.
Point 19, 1978 is 10.
Point 20, 1979 is 10.7.
Point 21, 1980 is 11.4.
Point 22, 1981 is 11.9.
Point 23, 1982 is 11.
Point 24, 1983 is 9.1.
Point 25, 1984 is 11.1.
Point 26, 1985 is 11.5.
Point 27, 1986 is 10.4.
Point 28, 1987 is 10.2.
Point 29, 1988 is 10.5.
Point 30, 1989 is 10.6.
Point 31, 1990 is 11.1.
Point 32, 1991 is 11.3.
Point 33, 1992 is 11.4.
Point 34, 1993 is 11.4.
Point 35, 1994 is 12.6.
Point 36, 1995 is 11.7.
Point 37, 1996 is 12.3.
Point 38, 1997 is 12.4.
Point 39, 1998 is 12.3.
Point 40, 1999 is 12.5.
Point 41, 2000 is 12.3.
Point 42, 2001 is 11.5.
Point 43, 2002 is 12.
Point 44, 2003 is 12.
Line 2, .
Point 1, 1960 is 2.6.
Point 2, 1961 is 2.6.
Point 3, 1962 is 2.8.
Point 4, 1963 is 3.1.
Point 5, 1964 is 3.4.
Point 6, 1965 is 3.5.
Point 7, 1966 is 3.9.
Point 8, 1967 is 4.3.
Point 9, 1968 is 4.5.
Point 10, 1969 is 4.7.
Point 11, 1970 is 4.6.
Point 12, 1971 is 4.8.
Point 13, 1972 is 4.9.
Point 14, 1973 is 5.1.
Point 15, 1974 is 5.1.
Point 16, 1975 is 4.5.
Point 17, 1976 is 5.2.
Point 18, 1977 is 5.6.
Point 19, 1978 is 5.1.
Point 20, 1979 is 5.6.
Point 21, 1980 is 5.4.
Point 22, 1981 is 5.4.
Point 23, 1982 is 4.8.
Point 24, 1983 is 4.1.
Point 25, 1984 is 4.9.
Point 26, 1985 is 4.7.
Point 27, 1986 is 4.2.
Point 28, 1987 is 4.
Point 29, 1988 is 4.1.
Point 30, 1989 is 4.1.
Point 31, 1990 is 4.3.
Point 32, 1991 is 4.2.
Point 33, 1992 is 4.2.
Point 34, 1993 is 4.4.
Point 35, 1994 is 4.5.
Point 36, 1995 is 4.4.
Point 37, 1996 is 4.5.
Point 38, 1997 is 4.6.
Point 39, 1998 is 4.6.
Point 40, 1999 is 4.3.
Point 41, 2000 is 4.3.
Point 42, 2001 is 4.3.
Point 43, 2002 is 4.6.
Point 44, 2003 is 4.3.
Line 3, .
Point 1, 1960 is 2.2.
Point 2, 1961 is 2.2.
Point 3, 1962 is 2.3.
Point 4, 1963 is 2.5.
Point 5, 1964 is 2.7.
Point 6, 1965 is 2.8.
Point 7, 1966 is 3.2.
Point 8, 1967 is 3.6.
Point 9, 1968 is 3.8.
Point 10, 1969 is 3.9.
Point 11, 1970 is 4.
Point 12, 1971 is 4.2.
Point 13, 1972 is 4.3.
Point 14, 1973 is 4.6.
Point 15, 1974 is 5.1.
Point 16, 1975 is 4.5.
Point 17, 1976 is 5.2.
Point 18, 1977 is 5.8.
Point 19, 1978 is 5.5.
Point 20, 1979 is 6.2.
Point 21, 1980 is 6.2.
Point 22, 1981 is 6.3.
Point 23, 1982 is 5.6.
Point 24, 1983 is 4.8.
Point 25, 1984 is 5.8.
Point 26, 1985 is 5.6.
Point 27, 1986 is 5.1.
Point 28, 1987 is 4.8.
Point 29, 1988 is 5.
Point 30, 1989 is 4.8.
Point 31, 1990 is 5.2.
Point 32, 1991 is 5.
Point 33, 1992 is 5.
Point 34, 1993 is 5.1.
Point 35, 1994 is 5.3.
Point 36, 1995 is 5.1.
Point 37, 1996 is 5.3.
Point 38, 1997 is 5.4.
Point 39, 1998 is 5.3.
Point 40, 1999 is 5.
Point 41, 2000 is 5.
Point 42, 2001 is 4.9.
Point 43, 2002 is 5.
Point 44, 2003 is 5.