-77.07% is the change from 820 to 188
Calculation steps:
[( 188 - 820 ) ÷ 820] x 100 = -77.07%
Formula
Percentage change = [(188 - 820) / 820] x 100
Subtract the new number by the original number
188 - 820 = -632
-632 ÷ 820 = -0.7707317073170732
-0.7707317073170732 x 100 = -77.07%