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]
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
17 May          7        0        0        0        0
18 May          1        0        0        0        0
19 May          4        0        0        0        0
20 May          2        0        1        0        0
21 May          1        0        0        1        0
22 May          1        1        0        0        0
23 May          0        0        1        0        0
24 May          4        1        1        0        0
25 May          3        0        1        0        0
26 May          1        0        1        0        0
27 May          1        1        0        0        0
28 May          2        1        0        0        0
29 May          2        0        1        0        0
30 May          1        0        1        0        0
31 May          0        0        1        0        0
1 Jun.          2        0        2        0        0
2 Jun.          1        0        2        0        0
3 Jun.          4        1        1        0        0
4 Jun.          2        0        2        0        0
5 Jun.          4        1        1        0        0
6 Jun.          2        1        1        0        0
7 Jun.          3        0        0        1        0
8 Jun.          1        2        0        0        0
9 Jun.          5        2        1        0        0
10 Jun.         4        0        1        0        0
11 Jun.         7        0        0        0        0