-3.97% is the change from 857 to 823
Calculation steps:
[( 823 - 857 ) ÷ 857] x 100 = -3.97%
Formula
Percentage change = [(823 - 857) / 857] x 100
Subtract the new number by the original number
823 - 857 = -34
-34 ÷ 857 = -0.039673278879813305
-0.039673278879813305 x 100 = -3.97%