-80.16% is the change from 857 to 170
Calculation steps:
[( 170 - 857 ) ÷ 857] x 100 = -80.16%
Formula
Percentage change = [(170 - 857) / 857] x 100
Subtract the new number by the original number
170 - 857 = -687
-687 ÷ 857 = -0.8016336056009334
-0.8016336056009334 x 100 = -80.16%