North
West East
South

-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
-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