Hello @BarbaraN3. Thanks for coming into the Community! At this time, we do not have a way to run a report of unsubscribes by year. You can export the unsubscribes from your account however, this will not display when the contact had unsubscribed from your mailing list.
Although we cannot automatically generate this report, it can be manually created. Under the Reporting tab in your account, you can view the number of unsubscribes per campaign so you can search through your campaigns that were sent in 2016 to determine how many unsubscribed over the year. I will certainly submit feedback for you about having this type of reporting available in your account.
Caitlin M. Community & Social Media Support
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