-20.1% is the change from 811 to 648
Calculation steps:
[( 648 - 811 ) ÷ 811] x 100 = -20.1%
Formula
Percentage change = [(648 - 811) / 811] x 100
Subtract the new number by the original number
648 - 811 = -163
-163 ÷ 811 = -0.20098643649815043
-0.20098643649815043 x 100 = -20.1%