0 - 10:  1   1
  11 - 20:  1   2
  21 - 30:  6   8
  31 - 40: 14  22
  41 - 50: 20  42
  51 - 60: 31  73
  61 - 70: 26  99
  71 - 80: 18 117
  81 - 90: 10 127
 91 - 100:  3 130

average:  57.92