Share 'How Many Disc Golfers Are There?'

How many disc golfers are there? Are you a "golfer" if you play twice a year? Are you a disc golfer if you play twice a year? How many disc golf rounds are played in a year? How many rounds does the average disc golfer play a year? How many rounds does the average PDGA member play in a year? Does anyone who has ever played disc golf count as a disc golfer?