-79.57% is the change from 837 to 171
Calculation steps:
[( 171 - 837 ) ÷ 837] x 100 = -79.57%
Formula
Percentage change = [(171 - 837) / 837] x 100
Subtract the new number by the original number
171 - 837 = -666
-666 ÷ 837 = -0.7956989247311828
-0.7956989247311828 x 100 = -79.57%