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
10500
10499
10498
10497
10496
10495
10494
10493
10492
10491
10490
10489
10488
10487
10486
10485
10484
10483
10482
10481
10480