-50.16% is the change from 319 to 159
Calculation steps:
[( 159 - 319 ) ÷ 319] x 100 = -50.16%
Formula
Percentage change = [(159 - 319) / 319] x 100
Subtract the new number by the original number
159 - 319 = -160
-160 ÷ 319 = -0.5015673981191222
-0.5015673981191222 x 100 = -50.16%