-53.66% is the change from 861 to 399
Calculation steps:
[( 399 - 861 ) ÷ 861] x 100 = -53.66%
Formula
Percentage change = [(399 - 861) / 861] x 100
Subtract the new number by the original number
399 - 861 = -462
-462 ÷ 861 = -0.5365853658536586
-0.5365853658536586 x 100 = -53.66%