You can view your Affiliate Payout history anytime by visiting your Easy Affiliate > Pay Affiliates > Payout History tab (near the top).
This will list each payout amount you've made for each individual affiliate.
You can search for a particular affiliate (by username) using the Search box at the top.
You can also export the data using either the Export table as CSV (X records) or Export all as CSV (X records) links. The former will export the current page results, and the latter will export all pages of the current results.