The way I have queried the data for the first chart is from the hivesql database from @arcange from the table VOProposalPays, where the receiver is the steem.dao account.

I'm not totally sure how this is calculated and what ends in this table. I'm wondering is the operation that you are pointing out stored on the hivesql somewhere and will be happy if @arcange can clear this out.

Otherwise I just might do some manual calculation about the daily amount of HBD added from inflation for a one year, but that would be approximate.