Missiles tech

Level	Credits
1	8
2	12
3	18
4	27
5	41
6	61
7	92
8	137
9	206
10	308
11	462
12	692
13	1,038
14	1,557
15	2,336
16	3,504
17	5,255
18	7,883
19	11,824
20	17,735