year	birthrt
1940	7
1941	8
1942	8
1943	8
1944	9
1945	10
1946	11
1947	12
1948	13
1949	13
1950	14
1951	15
1952	16
1953	17
1954	19
1955	19
1956	20
1957	21
1958	21
1959	22
1960	22
1961	23
1962	22
1963	23
1964	23
1965	23
1966	23
1967	24
1968	24
1969	25
1970	26
1971	26
1972	25
1973	24
1974	24
1975	25
1976	24
1977	26
1978	26
1979	27
1980	28
1981	30
1982	30
1983	30
1984	31
1985	33
1986	34
1987	36
1988	39
1989	42
1990	44
1991	45
1992	45