Choropleth map in ArcGIS Pro with range slider

choroplethnotes.txt

Before I forget...

Starting with NZ Police Station boundaries - clipping to nz polygon coastline, and 
using an extract from policedata.nz to get victimisation data.

Victimisation data is year, police station name, sumvictimisation.

To get the one to many join to work for some reason I had to copy the imported csv victimisation data over to the geodatabase and 
in the docs it said I also needed to create a unique row id - so I did that first using monotonically_increasing_id() AS vid

Then create the join with one police station to many year/victimsations.

Create symbology for the victimisation field.

Then double click on the feature layer containing the one to many values ie one boundary id to many combos of 
year/victimisations to  bring up the range dialog: