-80.02% is the change from 821 to 164
Calculation steps:
[( 164 - 821 ) ÷ 821] x 100 = -80.02%
Formula
Percentage change = [(164 - 821) / 821] x 100
Subtract the new number by the original number
164 - 821 = -657
-657 ÷ 821 = -0.8002436053593179
-0.8002436053593179 x 100 = -80.02%