-22.15% is the change from 817 to 636
Calculation steps:
[( 636 - 817 ) ÷ 817] x 100 = -22.15%
Formula
Percentage change = [(636 - 817) / 817] x 100
Subtract the new number by the original number
636 - 817 = -181
-181 ÷ 817 = -0.2215422276621787
-0.2215422276621787 x 100 = -22.15%