2 -  3.5 **
 4 -  5.5 **
 6 -  7.5 ****
 8 -  9.5 ******
10 - 11.5 *****
12 - 13.5 ***
14 - 15.5 *******
16 - 17.5 **
18 - 19.5 **
20 - 21.5 ******
22 - 23.5 ****
24 - 25.5 **
26 - 27.5 **
28 - 29.5 **