-81.9% is the change from 917 to 166
Calculation steps:
[( 166 - 917 ) ÷ 917] x 100 = -81.9%
Formula
Percentage change = [(166 - 917) / 917] x 100
Subtract the new number by the original number
166 - 917 = -751
-751 ÷ 917 = -0.8189749182115594
-0.8189749182115594 x 100 = -81.9%