-79.67% is the change from 851 to 173
Calculation steps:
[( 173 - 851 ) ÷ 851] x 100 = -79.67%
Formula
Percentage change = [(173 - 851) / 851] x 100
Subtract the new number by the original number
173 - 851 = -678
-678 ÷ 851 = -0.7967097532314924
-0.7967097532314924 x 100 = -79.67%