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