-81.37% is the change from 918 to 171
Calculation steps:
[( 171 - 918 ) ÷ 918] x 100 = -81.37%
Formula
Percentage change = [(171 - 918) / 918] x 100
Subtract the new number by the original number
171 - 918 = -747
-747 ÷ 918 = -0.8137254901960784
-0.8137254901960784 x 100 = -81.37%