-22.72% is the change from 823 to 636
Calculation steps:
[( 636 - 823 ) ÷ 823] x 100 = -22.72%
Formula
Percentage change = [(636 - 823) / 823] x 100
Subtract the new number by the original number
636 - 823 = -187
-187 ÷ 823 = -0.22721749696233293
-0.22721749696233293 x 100 = -22.72%