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
2750
2749
2748
2747
2746
2745
2744
2743
2742
2741
2740
2739
2738
2737
2736
2735
2734
2733
2732
2731
2730