1945	1946	1947	1948	1949
	1950	1951	1952	1953	1954
		1955	1956	1957	1958	1959
			1960	1961	1962	1963	1964
				1965	1966	1967	1968	1969
			1970	1971	1972	1973	1974
		1975	1976	1977	1978	1979
	1980	1981	1982	1983	1984
1985	1986	1987	1988	1989					1990