As an administrator, you have access to the group's data and email list.
Click the "Emails" tab to view a list of all emails that have been created that target the group's list with the date they were sent for emails, as well as who created the email, statistics and links to duplicate, edit, and manage each.
You can download your email statistics here too. The download will include each email you've sent, with various information about the email, like the subject, reply-to, from, and statistics. You can select a start and end date for the report as well.
You can also view your email campaigns. More on email campaigns here.