les titres des colonnes:
[1] - Google Chrome
[2] - Firefox
[3] - Microsoft Edge
[4] - Opera (Blink)
[5] - Safari 1
Date          [1]      [2]      [3]      [4]      [5]
17 nov       74.1        0     11.1      3.7      3.7
24 nov       87.5        0      6.2        0        0
1 dec        68.2     18.2        0      4.5        0
8 dec        83.3      8.3      8.3        0        0
15 dec       74.1     14.8      7.4      3.7        0
22 dec       73.3      6.7      6.7        0      6.7
29 dec         75     14.3      3.6      7.1        0
5 jan          75     12.5      6.2      6.2        0
12 jan       77.8     11.1      5.6        0        0
19 jan       97.4        0      2.6        0        0
26 jan       74.2      9.7      6.5      3.2      3.2
2 fev        95.5      1.5      1.5        0        0
9 fev        73.9      4.3      8.7      4.3        0
16 fev       61.1      5.6      8.3      2.8        0
23 fev       77.3        0      9.1      4.5      4.5
2 mar        65.2       13      4.3        0        0
9 mar        77.3     13.6      9.1        0        0
16 mar         70       10       10        0        0
23 mar       79.3      3.4      6.9      3.4        0
30 mar       91.9        0      5.4        0        0
6 avr        83.3        0       10      3.3        0
13 avr       79.3     10.3      3.4      3.4        0
20 avr       80.8      7.7      3.8        0        0
27 avr       73.7     10.5     10.5      2.6        0
4 mai        64.7     11.8     11.8      2.9        0
11 mai       76.5     17.6      2.9        0        0
18 mai       80.6      3.2      6.5        0      3.2
25 mai       78.3      6.5     10.9      2.2      2.2
1 juin       69.4      5.6     11.1      5.6        0
8 juin       73.3     13.3        0        0        0
9 juin        100        0        0        0        0