Contacts Live Contacts lets you see the subscription statistics.
Click Reports -> Sign Up Statistics to access the list of the contacts and their status (e.g. "Pending", "Normal") subscribed to contacts database grouped by date. Select your date range and click Run Report.
Click Reports -> Unsubscribed E-mail Recipients to access the list of the recipients who have unsubscribed from Contacts Live Contacts grouped by date. Select your date range, sorting criteria, and click Run Report.