year incidence sunspot 
 1 1936       0.9      40
 2 1937       0.8     115
 3 1938       0.8     100
 4 1939       1.3      80
 5 1940       1.4      60
 6 1941       1.2      40
 7 1942       1.7      23
 8 1943       1.8      10
 9 1944       1.6      10
10 1945       1.5      25
11 1946       1.5      75
12 1947       2.0     145
13 1948       2.5     130
14 1949       2.7     130
15 1950       2.9      80
16 1951       2.5      65
17 1952       3.1      20
18 1953       2.4      10
19 1954       2.2       5
20 1955       2.9      10
21 1956       2.5      60
22 1957       2.6     190
23 1958       3.2     180
24 1959       3.8     175
25 1960       4.2     120
26 1961       3.9      50
27 1962       3.7      35
28 1963       3.3      20
29 1964       3.7      10
30 1965       3.9      15
31 1966       4.1      30
32 1967       3.8      60
33 1968       4.7     105
34 1969       4.4     105
35 1970       4.8     105
36 1971       4.8      80
37 1972       4.8      65