-49.84% is the change from 636 to 319
Calculation steps:
[( 319 - 636 ) ÷ 636] x 100 = -49.84%
Formula
Percentage change = [(319 - 636) / 636] x 100
Subtract the new number by the original number
319 - 636 = -317
-317 ÷ 636 = -0.49842767295597484
-0.49842767295597484 x 100 = -49.84%