-70.93% is the change from 571 to 166
Calculation steps:
[( 166 - 571 ) ÷ 571] x 100 = -70.93%
Formula
Percentage change = [(166 - 571) / 571] x 100
Subtract the new number by the original number
166 - 571 = -405
-405 ÷ 571 = -0.7092819614711033
-0.7092819614711033 x 100 = -70.93%