1981/2 =
14.0712472794703
3961/2 =
19.8997487421324
5941/2 =
24.3721152139079
7921/2 =
28.1424945589406
9901/2 =
31.4642654451046
11881/2 =
34.4673758792282
13861/2 =
37.2290209379726
15841/2 =
39.7994974842648
17821/2 =
42.2137418384109
19801/2 =
44.497190922574