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
10600
10599
10598
10597
10596
10595
10594
10593
10592
10591
10590
10589
10588
10587
10586
10585
10584
10583
10582
10581
10580