Y \ X
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
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
13400
13399
13398
13397
13396
13395
13394
13393
13392
13391
13390
13389
13388
13387
13386
13385
13384
13383
13382
13381
13380