-93.42% is the change from 866 to 57
Calculation steps:
[( 57 - 866 ) ÷ 866] x 100 = -93.42%
Formula
Percentage change = [(57 - 866) / 866] x 100
Subtract the new number by the original number
57 - 866 = -809
-809 ÷ 866 = -0.9341801385681293
-0.9341801385681293 x 100 = -93.42%