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
10950
10949
10948
10947
10946
10945
10944
10943
10942
10941
10940
10939
10938
10937
10936
10935
10934
10933
10932
10931
10930