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
9810
9809
9808
9807
9806
9805
9804
9803
9802
9801
9800
9799
9798
9797
9796
9795
9794
9793
9792
9791
9790