-50.47% is the change from 319 to 158
Calculation steps:
[( 158 - 319 ) ÷ 319] x 100 = -50.47%
Formula
Percentage change = [(158 - 319) / 319] x 100
Subtract the new number by the original number
158 - 319 = -161
-161 ÷ 319 = -0.5047021943573667
-0.5047021943573667 x 100 = -50.47%