-20.35% is the change from 811 to 646
Calculation steps:
[( 646 - 811 ) ÷ 811] x 100 = -20.35%
Formula
Percentage change = [(646 - 811) / 811] x 100
Subtract the new number by the original number
646 - 811 = -165
-165 ÷ 811 = -0.2034525277435265
-0.2034525277435265 x 100 = -20.35%