-46.39% is the change from 319 to 171
Calculation steps:
[( 171 - 319 ) ÷ 319] x 100 = -46.39%
Formula
Percentage change = [(171 - 319) / 319] x 100
Subtract the new number by the original number
171 - 319 = -148
-148 ÷ 319 = -0.46394984326018807
-0.46394984326018807 x 100 = -46.39%