les titres des colonnes:
[1] - Google
[2] - Yandex
[3] - Search. Mail.ru
[4] - Bing
Date          [1]      [2]      [3]      [4]
27 oct       11.1     88.9        0        0
3 nov        89.5     10.5        0        0
10 nov         50       50        0        0
17 nov       66.7     33.3        0        0
24 nov         50       50        0        0
1 dec        37.5     62.5        0        0
8 dec          50       50        0        0
15 dec         60       40        0        0
22 dec         50       50        0        0
29 dec       28.6     71.4        0        0
5 jan        14.3     85.7        0        0
12 jan         10       90        0        0
19 jan          0      100        0        0
26 jan          0      100        0        0
2 fev        29.7       70     0.24        0
9 fev        30.9       68        1        0
16 fev       12.5     87.5        0        0
23 fev          0      100        0        0
2 mar           0        0        0        0
9 mar        28.6     71.4        0        0
16 mar       37.5     62.5        0        0
23 mar         50       50        0        0
30 mar        100        0        0        0
6 avr         100        0        0        0
13 avr       44.4     55.6        0        0
20 avr          0      100        0        0
27 avr       33.3     66.7        0        0
4 mai         100        0        0        0
11 mai       22.2     77.8        0        0
18 mai          0      100        0        0
20 mai          0      100        0        0