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
4010
4009
4008
4007
4006
4005
4004
4003
4002
4001
4000
3999
3998
3997
3996
3995
3994
3993
3992
3991
3990