20.38% is the change from 677 to 815
Calculation steps:
[( 815 - 677 ) ÷ 677] x 100 = 20.38%
Formula
Percentage change = [(815 - 677) / 677] x 100
Subtract the new number by the original number
815 - 677 = 138
138 ÷ 677 = 0.2038404726735598
0.2038404726735598 x 100 = 20.38%