def bbd_to_vote_pct(self, sbd, post_rshares=0, steem_power=None, vests=None, voting_power=STEEM_100_PERCENT, not_broadcasted_vote=True, use_stored_data=True):
        """ Obtain the voting percentage for a desired SBD value
            for a given Steem Power or vesting shares and voting power
            Give either Steem Power or vests, not both.
            When the output is greater than 10000 or smaller than -10000,