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
4290
4289
4288
4287
4286
4285
4284
4283
4282
4281
4280
4279
4278
4277
4276
4275
4274
4273
4272
4271
4270