The first item you can find in the Reports page is the Total Sponsorships Accepted. This is the total number of offers you have accepted from a sponsor. You can select the date range and channel of these by editing the Start Date, End Date, and Select Channel fields, and clicking the Search button. The graph on the left will be a breakdown by month, while the pie graph on the right is a breakdown by channels.
When you scroll to bottom of the Reports page, you can all of the numbers of offers per month and how much profit you gained from them.