why?

Why is it, when i first joined and started entering bills my CMT score went up really fast… (went to 200 within my first say 25 bills entered) now its going up REALLY slow… how is that score calculated?

sqare root( natural log(bills entered )) * natural log ( bills of your hit)* x factor

x factor is a number .. I am not sure what but it is around 75 or 80
then there is a time factor where if you don't enter each day it goes down