Thanks for the positive response. I thought I would just add a couple more to look at what other impacts circulating supply may be having. Firstly does the circulating supply have any effect on percentage change? i.e. does having more or less coins in circulation provide you with any protection to the 'BTC dump effect' that brings down all the other coins with it?

The answer, it would seem, is no:

There is no line you can draw which gives a decent R^2 value or any sense of a real relationship. We can therefore conclude there is no benefit seen for high or low circulating supply coins - when BTC dumps it drags down most with it!

I've marked on a few of the outliers just for interest - its been a good week to be in Bytecoin!