2018 Day One Early Voting turnout for the Democratic Primary for those counties is: 34,807

2016 Day One Early Voting turnout for the Democratic Primary was: 16,790

2014 Day One Early Voting turnout for the Democratic Primary was: 10,051

You can clearly see that its a bit more than 7% increase. It more than doubled.

Republican turnout on Day One is:

2014 = 14,605

2016 = 21,667

2018 = 15,107