These registers are published weekly, and contain the weekly sums of all incoming transactions to each account, whose receipts were registered the previous week - [i.e. to the extent we have received the receipts of these transactions]. Transactions might very well have happened that we know nothing about.
On each line, first is start date of the given seven day time frame. After that you'll find the total sum of all registered receipts of transactions to that account. Lastly, you'll find the ID of the account in question.