-83.01% is the change from 977 to 166
Calculation steps:
[( 166 - 977 ) ÷ 977] x 100 = -83.01%
Formula
Percentage change = [(166 - 977) / 977] x 100
Subtract the new number by the original number
166 - 977 = -811
-811 ÷ 977 = -0.8300921187308086
-0.8300921187308086 x 100 = -83.01%