Column titles:
[1] - 1 session
[2] - 2 sessions
[3] - from 3 to 5 sessions
[4] - from 6 to 10 sessions
[5] - more than 10 sessions
Date          [1]      [2]      [3]      [4]      [5]
16 Apr.         2        0        1        0        1
17 Apr.         4        2        1        0        0
18 Apr.         1        0        0        0        0
19 Apr.         3        0        0        1        0
20 Apr.         1        0        0        0        1
21 Apr.         2        0        1        0        0
22 Apr.         1        0        0        1        0
23 Apr.         4        0        1        0        0
24 Apr.         2        0        1        0        0
25 Apr.         4        1        0        0        0
26 Apr.         0        0        0        1        0
27 Apr.         2        0        1        1        0
28 Apr.         1        0        1        0        0
29 Apr.         2        0        1        0        0
30 Apr.         3        1        1        0        0
1 May           2        0        2        0        0
2 May           3        0        1        0        0
3 May           2        0        1        0        0
4 May           0        0        1        0        0
5 May           3        2        0        0        0
6 May           3        0        0        1        0
7 May           1        0        2        0        0
8 May           3        0        2        0        0
9 May           1        2        0        1        0
10 May          2        2        0        0        0
11 May          3        0        0        0        0
12 May          2        1        1        0        0
13 May          0        0        1        0        0
14 May          0        0        1        0        0
15 May          1        0        0        1        0
16 May          4        0        1        0        0