If I understand you correct your report now only show due amout for the selected year (2019 in this case) but you want it to show all years prior to 2019, is that correct?
If so you need to use a parameter assigned to the drop-down list. You also need to remove the drop-down from the prompt area and instead put it on the report area (where the bar chart is located).
Assign the parameter and then create filters for the bar chart and text objects saying (due_date_year < [parameter].
I am on the right track 🙂 ?
//Fredrik
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