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
2110
2109
2108
2107
2106
2105
2104
2103
2102
2101
2100
2099
2098
2097
2096
2095
2094
2093
2092
2091
2090