20 2.806 0.015
21 2.862 0.012
22 2.829 0.011
23 2.829 0.009
25 2.794 0.010
26 2.814 0.010
27 2.836 0.011
28 2.862 0.012
29 2.919 0.016
30 2.942 0.021
31 2.985 0.014