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
15460
15459
15458
15457
15456
15455
15454
15453
15452
15451
15450
15449
15448
15447
15446
15445
15444
15443
15442
15441
15440