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
4640
4639
4638
4637
4636
4635
4634
4633
4632
4631
4630
4629
4628
4627
4626
4625
4624
4623
4622
4621
4620