-80.73% is the change from 851 to 164
Calculation steps:
[( 164 - 851 ) ÷ 851] x 100 = -80.73%
Formula
Percentage change = [(164 - 851) / 851] x 100
Subtract the new number by the original number
164 - 851 = -687
-687 ÷ 851 = -0.8072855464159812
-0.8072855464159812 x 100 = -80.73%