-39.9% is the change from 812 to 488
Calculation steps:
[( 488 - 812 ) ÷ 812] x 100 = -39.9%
Formula
Percentage change = [(488 - 812) / 812] x 100
Subtract the new number by the original number
488 - 812 = -324
-324 ÷ 812 = -0.39901477832512317
-0.39901477832512317 x 100 = -39.9%