-20.19% is the change from 857 to 684
Calculation steps:
[( 684 - 857 ) ÷ 857] x 100 = -20.19%
Formula
Percentage change = [(684 - 857) / 857] x 100
Subtract the new number by the original number
684 - 857 = -173
-173 ÷ 857 = -0.20186697782963828
-0.20186697782963828 x 100 = -20.19%