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
14550
14549
14548
14547
14546
14545
14544
14543
14542
14541
14540
14539
14538
14537
14536
14535
14534
14533
14532
14531
14530