I was wondering if there would be pressure for it to rise.
I say that because SBD is limited to a certain percentage of the value of Steem. When it exceeds that limit - part of the author rewards are paid out in Steem instead of SBD, That is what is happening at the moment if you look at your rewards.
So in that sense a lower then normal amount of SBD is being created as compared to Steem.