Go to My Account/Affiliate Settings. Click "Check Amazon Earnings. You will be taken directly to their site. After you enter your email, and password, scroll to the right. The right side of the page displays the report of earnings. Select "view all", and change the report mode to daily trends. You will have an option to change the date range as well. The daily trends will show the number of adds that have been clicked.
You must have an affilate code, provided by Amazon, after you've registered for the program. If not, scroll to the bottom of your HubPage and click "learning center". Select affiliate programs, and follow the instructions to register. I hope this helps.