If you're interested in getting the information directly, check out SteemData.
The type of query I'm using is:
db.getCollection('AccountOperations').count({type: 'transfer', to: 'null', timestamp: {'$gt': new Date(ISODate().getTime() - 1000 * 86400 * 30)}})
Which asks for the number of transfers to the null account in the past 30 days and returns 2907. You can put that query into RoboMongo.
Thank you! I'll use it. :wink: