-20.89% is the change from 857 to 678
Calculation steps:
[( 678 - 857 ) ÷ 857] x 100 = -20.89%
Formula
Percentage change = [(678 - 857) / 857] x 100
Subtract the new number by the original number
678 - 857 = -179
-179 ÷ 857 = -0.2088681446907818
-0.2088681446907818 x 100 = -20.89%