-51.41% is the change from 319 to 155
Calculation steps:
[( 155 - 319 ) ÷ 319] x 100 = -51.41%
Formula
Percentage change = [(155 - 319) / 319] x 100
Subtract the new number by the original number
155 - 319 = -164
-164 ÷ 319 = -0.5141065830721003
-0.5141065830721003 x 100 = -51.41%