Thanks everyone for your replies. Some really good resources there. Much appreciated.
Looks interesting but I'm not sure how to interpret this chart.
The URL says "bitcoin-addresses-with-balance-more-than-or-equal-to-0-1" - if this means that only addresses with balances with
BTC0.1 or more are considered, I'm guessing a lot of small retail investors would be exluded from the data.
And it's showing a ratio between addresses with balances of
BTC0.1 -
BTC10 to adresses with
BTC1,000 or more. So (without going into too much detail) it's possible that it's not always a fair reflection of increase/decrease in retail participation. Still useful though.