-83.03% is the change from 978 to 166
Calculation steps:
[( 166 - 978 ) ÷ 978] x 100 = -83.03%
Formula
Percentage change = [(166 - 978) / 978] x 100
Subtract the new number by the original number
166 - 978 = -812
-812 ÷ 978 = -0.8302658486707567
-0.8302658486707567 x 100 = -83.03%