-20.22% is the change from 811 to 647
Calculation steps:
[( 647 - 811 ) ÷ 811] x 100 = -20.22%
Formula
Percentage change = [(647 - 811) / 811] x 100
Subtract the new number by the original number
647 - 811 = -164
-164 ÷ 811 = -0.20221948212083848
-0.20221948212083848 x 100 = -20.22%