Don't know that market... but assume the first group of communities is the more expensive ones, and the later group the cheaper ones?
For any research ^^^ like that, you'd need to run a series of control searches for several past similar intervals of time. Say, the same criteria but with totals for each of the last 8 quarters? Even if there are fewer sales in the expensive communities in a recent period, it still may be more than had sold at other less recent times in those same communities.
One thing that is somewhat surprising to many who don't run these type of statistical searches (including Realtors), is that because of historic shorter times on market for cheaper homes, and longer times for the most expensive ones... most communities have a way higher percentage of both more moderately priced homes -and- sales thereof... than you would estimate by reviewing the list of active (for sale now) properties in that same community.
While a search of MLS active listings in a hypothetical community "Ehhh" might show that half the listings are priced below $500K and half above $500K. When you do a search of the same community by either their percentage of total built residences therein -or- the market share of the totality of homes sold over some period (like a year)... you'd find that as many as 4 or 5 times as many homes exist/sell under that hypothetical "mid point" of $500K as sell above it. Said another way; because more expensive homes sell slower and tend to bunch up over time in MLS, it LOOKS like they make up a bigger percentage of the market in that community than they really do when judged by inventory in MLS.
[/real estate spew]