Problem:1. Facebook does not allow you in their interface to show longer period than 3 months.
2. You cannot aggregate Facebook metrics (like Reach) in quarters to get bigger picture.
3. Of course, you also cannot compare these Facebook numbers with data from other sources, e.g. traffic which came to your website from Facebook (measured via Google Analytics)
All these reports you can can easily run in KPIwatchdog.com. Read more details about setup and achieved results at Medium