@focusnow, the calculation above is not clear. I noticed that you used two major factors to calculate the percentage. You used "The transfer to vesting" which is the total amount you had power up within a month, and this amount to 2100 steem and "normal transfer", which is the amount you transfered out within the same period and as highlighted above, for your case, it's 1106 steem.

Now, I want to believe that these two factors are summed up to be total earning for tge date range, if that is correct, then your total earning should be, 2100 STEEM + 1106 STEEM = 3206 STEEM

Then, to calculate the percentage you belong in the club initiative, it should be;

(Amount powered up/Total earning) × 100%
which is (2100/3206) × 100%
= 0.655 x100%
= 65.5%

That means your power up is far above half of your earning within the range under consideration.