Mike Policano,
If you take the 1970 and 1980 rating that averages somewhere in the top 20, you have to ask yourself, did all of the courses ranked above Pine Tree get moved up, up and away ?
In other words, if Pine Tree was # 27 and it's no longer on the top 100 today, did everycourse ranked 28 and higher also get bumped ?
If not, you have to wonder how the system could cause a course once ranked in the top 10, 20, 30, could be gradually removed from the list while other courses, not as well ranked, remained on the list.