squared rating sum |     rating sum
-------------------|---------------
29%, 13 - 0   = 13 | 17 - 0    = 17
29%, 26 - 13  = 13 | 34 - 17   = 17
30%, 40 - 26  = 14 | 52 - 34   = 18
33%, 57 - 40  = 17 | 72 - 52   = 20
48%, 92 - 57  = 35 | 101 - 72  = 29
52%, 133 - 92 = 41 | 132 - 101 = 31