The remaining third of the lines are split between 20 odd characters (40 if you count the one-line spear carriers, but I'm ignoring those), with percentages varying from 1% to 3%. A lot of them, convienently, turn up for a sizable scene and then disappear, which makes for fewer casting problems, or hang around in specific groups - ditto.
Not sure what this analysis has actually told me, admittedly. Mainly that the main characters have a greater proportion of lines than I'd hoped, but fewer than I'd feared. Which is comforting in it's own way.