-23.1% is the change from 827 to 636
Calculation steps:
[( 636 - 827 ) ÷ 827] x 100 = -23.1%
Formula
Percentage change = [(636 - 827) / 827] x 100
Subtract the new number by the original number
636 - 827 = -191
-191 ÷ 827 = -0.2309552599758162
-0.2309552599758162 x 100 = -23.1%