Further fluctuating slightly and going up again on day 56, reaching 12.22109817 on day 72. Then the rate increases more rapidly, see table below. From the latest elsets it seems to go up again till day 139 and then MM is increasing again. Perhaps Kurt Jonckheere can find some time to do a MM analyses, as he used to do in the past. I've requested historical TLE's from OIG for the period April 1st till present.
More accelerations are possible.
A lowering of the semi-major axis between day 103 and 111 by at least 140 meters is clearly visible on this graph.