rownames,Year,Calls
1,50,0.44
2,51,0.47
3,52,0.47
4,53,0.59
5,54,0.66
6,55,0.73
7,56,0.81
8,57,0.88
9,58,1.06
10,59,1.2
11,60,1.35
12,61,1.49
13,62,1.61
14,63,2.12
15,64,11.9
16,65,12.4
17,66,14.2
18,67,15.9
19,68,18.2
20,69,21.2
21,70,4.3
22,71,2.4
23,72,2.7
24,73,2.9