20.17% is the change from 813 to 977
Calculation steps:
[( 977 - 813 ) ÷ 813] x 100 = 20.17%
Formula
Percentage change = [(977 - 813) / 813] x 100
Subtract the new number by the original number
977 - 813 = 164
164 ÷ 813 = 0.2017220172201722
0.2017220172201722 x 100 = 20.17%