Y \ X
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
13570
13569
13568
13567
13566
13565
13564
13563
13562
13561
13560
13559
13558
13557
13556
13555
13554
13553
13552
13551
13550