-50.69% is the change from 866 to 427
Calculation steps:
[( 427 - 866 ) ÷ 866] x 100 = -50.69%
Formula
Percentage change = [(427 - 866) / 866] x 100
Subtract the new number by the original number
427 - 866 = -439
-439 ÷ 866 = -0.5069284064665127
-0.5069284064665127 x 100 = -50.69%