0.81% is the change from 615 to 620
Calculation steps:
[( 620 - 615 ) ÷ 615] x 100 = 0.81%
Formula
Percentage change = [(620 - 615) / 615] x 100
Subtract the new number by the original number
620 - 615 = 5
5 ÷ 615 = 0.008130081300813009
0.008130081300813009 x 100 = 0.81%