A company’s sales data (in lakhs) for three consecutive years is as…

A company’s sales data (in lakhs) for three consecutive years is as follows: Year 1 – North: 50, South: 60, East: 40; Year 2 – North: 55, South: 66, East: 44; Year 3 – North: 60, South: 72, East: 48. Which region shows the highest consistent percentage increase in sales over the three years?