Query to list Usage Details aggregated on data tier

I'm trying to do a deep analysis of our data tier usage for optimization. We would like to see granular metrics by week for each of the tier's credit usage. Currently I can see this via the Account / Account Overview tab but this lacks being able to use the data in our own reports (i.e. I can't simply download a CSV). How can I reproduce this data in a query? I can query total by collector but can't figure out how to join on dataTier. 

Thanks!