From here, simply click on the “Ledger” tab. You can now see a list of all of your transactions: how many you've earned, what you've earned them from, and the date you earned them on.
You can also see your total lifetime SB earned, as well as how many SB you currently have saved:
You can use this same sorting method to see how many SB you've earned through Searching, Shop & Earn, Swag Codes, Special Offers, Surveys, etc. You can also choose to sort by a specific date range. For example, if you wanted to see how many SB you have earned just last week, set your range and click “Apply”: