-25.44% is the change from 861 to 642
Calculation steps:
[( 642 - 861 ) ÷ 861] x 100 = -25.44%
Formula
Percentage change = [(642 - 861) / 861] x 100
Subtract the new number by the original number
642 - 861 = -219
-219 ÷ 861 = -0.25435540069686413
-0.25435540069686413 x 100 = -25.44%