-71.59% is the change from 820 to 233
Calculation steps:
[( 233 - 820 ) ÷ 820] x 100 = -71.59%
Formula
Percentage change = [(233 - 820) / 820] x 100
Subtract the new number by the original number
233 - 820 = -587
-587 ÷ 820 = -0.7158536585365853
-0.7158536585365853 x 100 = -71.59%