from 27/03 to 15/05/2021:   7=5, 14=10, 21=15

from 05/04 to 15/05/2021:   4=3

from 15/05 to 22/05/2021:   7=6

from 04/09 to 12/09/2021:   7=5

from 12/09 to 10/10/2021:    4=3, 7=5, 14=10, 21=15