2.99% is the change from 602 to 620
Calculation steps:
[( 620 - 602 ) ÷ 602] x 100 = 2.99%
Formula
Percentage change = [(620 - 602) / 602] x 100
Subtract the new number by the original number
620 - 602 = 18
18 ÷ 602 = 0.029900332225913623
0.029900332225913623 x 100 = 2.99%