Board Thread:Questions and Answers/@comment-5751180-20130708095051

OK obviously I know the chart has not been 100 singles since 1952, and that it started as 12 positions. It would help to know when and how long the charts were for all the years. I think it increased to a Top 40 around 1960 then Top 50 then a Top 75 and finally a Top 100, and then a Top 200 but you can't get it free. 