-21.58% is the change from 811 to 636
Calculation steps:
[( 636 - 811 ) ÷ 811] x 100 = -21.58%
Formula
Percentage change = [(636 - 811) / 811] x 100
Subtract the new number by the original number
636 - 811 = -175
-175 ÷ 811 = -0.2157829839704069
-0.2157829839704069 x 100 = -21.58%