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
9170
9169
9168
9167
9166
9165
9164
9163
9162
9161
9160
9159
9158
9157
9156
9155
9154
9153
9152
9151
9150