-31.13% is the change from 636 to 438
Calculation steps:
[( 438 - 636 ) ÷ 636] x 100 = -31.13%
Formula
Percentage change = [(438 - 636) / 636] x 100
Subtract the new number by the original number
438 - 636 = -198
-198 ÷ 636 = -0.3113207547169811
-0.3113207547169811 x 100 = -31.13%