If you have pending requests for a title, you will be able to see how many requests you have already approved or declined in a few places within your NetGalley account, including by downloading the Detailed Activity report for each title. Use this report to follow up with members, or to introduce them to a new title via a widget.
On the Manage Requests page, click "Stats" to view a quick snapshot of the title's Request History:
You will see this popup:
You can also click "View History" to view Members with Access for more detailed information about all types of approvals, including Wishes Granted.