Pivot Table % calculation

Since you have 2016 Pro Plus. You can add DAX measure to do this.

1. Add the table to data model.

2. Add following DAX measure (right click on the table in Pivot Table Fields pane).
=DIVIDE([Count of Month Live on EPCS],[Count of Implemented By],0)
0.JPG

3. Add the measure to values field.

See attached sample.

NOTE: This sort of calculation is impossible in traditional pivot table (without adding helper column(s) to source table).