-21.26% is the change from 823 to 648
Calculation steps:
[( 648 - 823 ) ÷ 823] x 100 = -21.26%
Formula
Percentage change = [(648 - 823) / 823] x 100
Subtract the new number by the original number
648 - 823 = -175
-175 ÷ 823 = -0.212636695018226
-0.212636695018226 x 100 = -21.26%