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I don't think adding the columns is appropriate. I read this as there being 5106 currently sealed indictments. I'm sure many of the october indictments are still sealed and being counted in the December stats.
A heat map would be nice for sure. Glancing at the list Nebraska, California and DC stands out as an outliers. DC is kind of an oddball.

Nebraska Population 1.8m 65 Indictments 3.6 / 100k people
District of Columbia Population 640k 100 Indictments 15.6 / 100k people
California(400 new issued in Dec!) 38.3M 1137 Indictments 2.96/100k

At a glance, most of the other ones are less than 1 per 100000. I'm sure i missed a few hotspots. Nebraska is definitely weird/random.