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
2650
2649
2648
2647
2646
2645
2644
2643
2642
2641
2640
2639
2638
2637
2636
2635
2634
2633
2632
2631
2630