-79.9% is the change from 811 to 163
Calculation steps:
[( 163 - 811 ) ÷ 811] x 100 = -79.9%
Formula
Percentage change = [(163 - 811) / 811] x 100
Subtract the new number by the original number
163 - 811 = -648
-648 ÷ 811 = -0.7990135635018496
-0.7990135635018496 x 100 = -79.9%