-20.69% is the change from 817 to 648
Calculation steps:
[( 648 - 817 ) ÷ 817] x 100 = -20.69%
Formula
Percentage change = [(648 - 817) / 817] x 100
Subtract the new number by the original number
648 - 817 = -169
-169 ÷ 817 = -0.20685434516523868
-0.20685434516523868 x 100 = -20.69%