As Tat notes, the loss of OpenSpaces sims is cancelled out by new regions being added- in the period between last month's composited map update and this month's shows that the grid has grown from the approximate size of West Yorkshire (2029sqkm) to the approximate size of Leicestershire (2083sqkm). However, I only started tracking the size of the mainland this month (the approximate size of the Isle of Wight, or about twice the size of Washington D.C.), so I've no idea how much of the increase in the size of the grid is due to mainland expansion.