Thanks for adding the CLAM marketcap to your site.
I have a list of historical moneysupply amounts if you want to go back and add them.
If so, how far apart do you want the samples? Every hour, every block, or what?
Alternatively, you can grab them from the blockchain yourself, like this, to get the supply as of block 100k for example:
$ clamd getblock $(clamd getblockhash 100000) | grep supply
"moneysupply" : 14801149.19280093,
"digsupply" : 62721.70172306,
"stakesupply" : 26747.78872897,
"activesupply" : 89469.49045203,
'activesupply' is the amount available (it's the sum of dig + stake) and 'moneysupply' is the total theoretically available at that point in time.
Would you be able to convert the block values to dates? One day apart would be sufficient.