0   6.2
 1   4.5
 2   3.9
 3   4.1
 4   3.1
 5   4.2
 6   3.6
 7   4.0
 8   4.4
 9   4.4
10   4.5
11   5.9
12   6.6
13   6.7
14  10.1
15  23.7