-51.1% is the change from 319 to 156
Calculation steps:
[( 156 - 319 ) ÷ 319] x 100 = -51.1%
Formula
Percentage change = [(156 - 319) / 319] x 100
Subtract the new number by the original number
156 - 319 = -163
-163 ÷ 319 = -0.5109717868338558
-0.5109717868338558 x 100 = -51.1%