-50.41% is the change from 861 to 427
Calculation steps:
[( 427 - 861 ) ÷ 861] x 100 = -50.41%
Formula
Percentage change = [(427 - 861) / 861] x 100
Subtract the new number by the original number
427 - 861 = -434
-434 ÷ 861 = -0.5040650406504065
-0.5040650406504065 x 100 = -50.41%