-81.62% is the change from 936 to 172
Calculation steps:
[( 172 - 936 ) ÷ 936] x 100 = -81.62%
Formula
Percentage change = [(172 - 936) / 936] x 100
Subtract the new number by the original number
172 - 936 = -764
-764 ÷ 936 = -0.8162393162393162
-0.8162393162393162 x 100 = -81.62%