Column titles:
[1] - Windows 10
[2] - Android
[3] - iOS iPhone
[4] - Windows 7
Date          [1]      [2]      [3]      [4]
9 May         100        0        0        0
10 May       66.7     33.3        0        0
11 May       33.3     66.7        0        0
12 May        100        0        0        0
13 May          0     66.7        0     33.3
14 May        100        0        0        0
15 May        100        0        0        0
16 May        100        0        0        0
17 May          0      100        0        0
18 May         50        0        0        0
19 May        100        0        0        0
20 May        100        0        0        0
21 May          0       50       50        0
22 May        100        0        0        0
23 May         75        0        0        0
24 May        100        0        0        0
25 May        100        0        0        0
26 May        100        0        0        0
27 May       57.1     42.9        0        0
28 May         50       25        0        0
29 May         25       50       25        0
30 May          0        0        0        0
31 May        100        0        0        0
1 Jun.          0      100        0        0
2 Jun.         50       50        0        0
3 Jun.          0     33.3     66.7        0
4 Jun.         50     16.7        0        0
5 Jun.       33.3        0     33.3     33.3
6 Jun.          0        0       50        0
7 Jun.         50        0       50        0
8 Jun.          0       50        0        0