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
13990
13989
13988
13987
13986
13985
13984
13983
13982
13981
13980
13979
13978
13977
13976
13975
13974
13973
13972
13971
13970