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
10820
10819
10818
10817
10816
10815
10814
10813
10812
10811
10810
10809
10808
10807
10806
10805
10804
10803
10802
10801
10800