Inference

1900	1962	1970	1980	1990	2000
1926	1963	1971	1981	1991	2001
1935	1964	1972	1982	1992	2002
1953	1966	1973	1983	1993	2003
	1968	1974	1984	1994	2004
	1969	1975	1985	1995	2005
		1976	1986	1996
		1977	1987	1997
		1978	1988	1998
		1979	1989	1999