-20.77% is the change from 857 to 679
Calculation steps:
[( 679 - 857 ) ÷ 857] x 100 = -20.77%
Formula
Percentage change = [(679 - 857) / 857] x 100
Subtract the new number by the original number
679 - 857 = -178
-178 ÷ 857 = -0.20770128354725786
-0.20770128354725786 x 100 = -20.77%