-82.9% is the change from 971 to 166
Calculation steps:
[( 166 - 971 ) ÷ 971] x 100 = -82.9%
Formula
Percentage change = [(166 - 971) / 971] x 100
Subtract the new number by the original number
166 - 971 = -805
-805 ÷ 971 = -0.8290422245108136
-0.8290422245108136 x 100 = -82.9%