I would love to see a graph of the daily GRC mint and/or total GRC over time. A lot of members reading up about the community ask about how the coin is sustainable with up to 50,000 GRC being minted by POR every day. If we could show them a figure of the daily POS and POR mint, and what that actually means as an inflation percentage, they may not be so worried anymore.
From memory, several people have been asking for daily POR and POS mint tallies anyway.
i think this ties in nicely to highcon and grider123's suggestion
Whilst there isn't a graph, you can see the daily amount minted on the block page when you scroll down and look at the past few days daily summaries. https://gridcoinstats.eu/block