Compare date range to year before in Web Analytics Dashboard export

[RM]

With the Web Analytics Dashboard, as a user, I want to compare a date range to the year before and export into a report so it can be shared internally. 

Currently, the exported dashboard will show data for the default date range (which can be changed in dashboard settings) and compares to the previous period (and NOT changeable to the year before).

Please provide this option to make the shared dashboards more valuable.