With his A Doll’s House, Part 2 the most-produced play, Lucas Hnath leads the list (excluding Shakespeare, of course) with 33 productions, edging out last season’s leader, Lauren Gunderson, who has 29. This year’s list is the most diverse in its 25-year history, with 11 female playwrights and six nonwhite ones. 17 of the 20 are American (including one immigrant), and all but three (August Wilson, Tennessee Williams, and Sam Shepard) are living.