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
10880
10879
10878
10877
10876
10875
10874
10873
10872
10871
10870
10869
10868
10867
10866
10865
10864
10863
10862
10861
10860