On May 8, Ohio held a primary for the Republican, Democratic, and Green Parties. The votes aren’t all counted yet, but it appears one-fifth of 1% of the voters chose a Green Party primary ballot.
By contrast, in 2016, only .11% of the voters chose a Green Party primary ballot. And in 2014, only about .07% did so.
Ohio gives all ballot-qualified parties a primary, except that newly-qualifying parties nominate by convention instead. The Libertarian Party expects to be a ballot-qualified party soon in Ohio, but its nominees will not be chosen in a primary.