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
8660
8659
8658
8657
8656
8655
8654
8653
8652
8651
8650
8649
8648
8647
8646
8645
8644
8643
8642
8641
8640