TL;DR: I want Contribution Aggregate by Relationship to show more years in the past.
I'm using the report "Contribution Aggregate by Relationship" to produce a report with columns for giving by year. However, it doesn't go back as many years as I'd like. I found how to control how many years it goes forward ("custom" date class in Settings - Date Preferences), but the same date class doesn't affect how far it goes back (three previous years then a catch-all for years before that). Is there something else that controls this? I need it to go back about 10 years or so.