I don't think there's such a chart, that I'm aware of, but it would be interesting to see one.
Maybe someone can take
this info and
this (or maybe something with more historical data, if it exists), combine them and create such a chart.
Well, here's an idea for my free time...
Great.
I was able to download the data for the block chain size, but the reachable nodes had no such facility as far as I could tell.
The nodes graph seems to be all reachable nodes, which is useful, but not as useful as knowing full nodes which require the full block chain. Is there a way to distinguish a full node from any old node or is the user agent sufficient?