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
10270
10269
10268
10267
10266
10265
10264
10263
10262
10261
10260
10259
10258
10257
10256
10255
10254
10253
10252
10251
10250