[butterdezillion]

I wonder if it’s the percentage that had been reported. Maybe these numbers were from before all the bigger counties were done reporting.

[Yosemitest]

If I had to absolutely offer an opinion to what it is, I'd GUESS that

it's the percentage of polling places IN THAT COUNTY that have reported in with their total votes.

BUT that IS an Educated W.A.G. (Wild @$$ GUESS)