-97.69% is the change from 866 to 20
Calculation steps:
[( 20 - 866 ) ÷ 866] x 100 = -97.69%
Formula
Percentage change = [(20 - 866) / 866] x 100
Subtract the new number by the original number
20 - 866 = -846
-846 ÷ 866 = -0.976905311778291
-0.976905311778291 x 100 = -97.69%