Mary,
I called HobieCat and Matt wasn't in, but I talked to Jack or Jacque??. He said that it's possible that since they supplied all the national boats back then, they would of started building early, but he thought it was weird that an 89 boat would of been built in August of 87. He did say that they are now making 16s for the World Championships in April of 04. He also mentioned that they build on average about eight 16s per day.
Jack