-23.19% is the change from 828 to 636
Calculation steps:
[( 636 - 828 ) ÷ 828] x 100 = -23.19%
Formula
Percentage change = [(636 - 828) / 828] x 100
Subtract the new number by the original number
636 - 828 = -192
-192 ÷ 828 = -0.2318840579710145
-0.2318840579710145 x 100 = -23.19%