Try this and compare to other pools (it makes some assumptions but also that you are fully ramped up for the 2 months):

January (to date):
 Your BTC= 0.991*8*12.5*1.3204*(your hasing power in TH/s) / (31980)

December:
 Your BTC= 0.991*10*12.5*1.2911*(your hasing power in TH/s) / (26210)

Will be interesting to see how it compares.

Edit: History is no guarantee of future
Edit 1: Kano worked for free in December 0% fee.
Edit 2: I cant do math 0.9% fee corrected