The amount of rakeback you can expect to earn obviously varies from player to player. It depends how often you play, what size (stakes) tables you play, and how many tables you play at once. All this contributes to the total rake that you pay, and therefore how much you can earn back.
For the Dealt Method of rakeback: As a guide going forward the approximate rake that you pay in a month can be calculated using the following formula:
Number of hands per hour = A
Average rake = (Average Pot size x 5% (up to a maximum of 3$) = B
Number of players per table = C
Number of hours you play a day = D
Number of days you play a month = E
Number of tables you play at once = F
Total rake you pay a month = (AxBxDxExF) divided by C
For Average Contributed and Average Weighted it is not possibly to get an accurate method because of the different styles of play of each player. As a very rough guide if you are a very loose player the rakeback calculation above is close, but if you are very tight then the rakeback calculation would be about 40% of the total you get above.