-80.85% is the change from 851 to 163
Calculation steps:
[( 163 - 851 ) ÷ 851] x 100 = -80.85%
Formula
Percentage change = [(163 - 851) / 851] x 100
Subtract the new number by the original number
163 - 851 = -688
-688 ÷ 851 = -0.8084606345475911
-0.8084606345475911 x 100 = -80.85%