Y \ X
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
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
11880
11879
11878
11877
11876
11875
11874
11873
11872
11871
11870
11869
11868
11867
11866
11865
11864
11863
11862
11861
11860