-13.29% is the change from 820 to 711
Calculation steps:
[( 711 - 820 ) ÷ 820] x 100 = -13.29%
Formula
Percentage change = [(711 - 820) / 820] x 100
Subtract the new number by the original number
711 - 820 = -109
-109 ÷ 820 = -0.1329268292682927
-0.1329268292682927 x 100 = -13.29%