The best type of graph to show ranking would be a bar graph so the reader is able to quickly view the size of each category in reference to one another.
For the class dataset, the service category with the most frequent claims is the same in both the Northern and Eastern Zones – Curative Care visits. In the Eastern zone, the service categories with the least frequent claims are Inpatient Medical and Inpatient Obstetrics. In the Northern Zone, the service category with the least frequent number of claims is Speech Therapy.