5 seems right, I thought left, because that way all fields have an arrow pointing to them somehow. Why do you think up?

Might be a bit late for your liking, but starting from 1965, you can also find the radio top 40 hits for every week: https://www.top40.nl/top40/1965/week-1

Literally nowhere in these remarks does it say “expansion” or “expansionism”…