I wanted to find out if the middle class was growing, and at a glance it does look that way, but....

... the pies above don't really show what is required :(
My original plan was to present the total Author Rewards earned by each class, but the problem is we only have the current standings.
These are today's numbers:
All accounts
What we don't have are last weeks, last months, or the numbers from 6 months ago, on an account by account basis.
E.g. A dolphin earning rewards in February 2019 will boost the author rewards percentage for Dolphins in February (correct). However, in October, they only owned 4000 SP (Minnow) but will still be placed in the Dolphin bracket due to the SP they own today (incorrect).
Yesterdays author rewards should be pretty accurate - not many accounts will have changed ranking overnight (there will likely be some though).
Accounts that received a payout
Which in % terms and grouped by class, looks a bit like

And I suppose I could update this post every day for 6 months - but would it really show much on a day by day basis?
- VESTS held/SP owned change constantly which makes it an absolute ball-ache to present historical data like this
- This is just Author Rewards (No interest, curation, witnessing, wallet sends, power-ups) - I'd like to include the lot if I was going to claim to be presenting findings on which class was growing the fastest.
It's quite shocking how much time some of us spend looking at data with a view to trying to present something of interest, sorry it didn't happen today :P
Cheers
Asher