-20.39% is the change from 814 to 648
Calculation steps:
[( 648 - 814 ) ÷ 814] x 100 = -20.39%
Formula
Percentage change = [(648 - 814) / 814] x 100
Subtract the new number by the original number
648 - 814 = -166
-166 ÷ 814 = -0.20393120393120392
-0.20393120393120392 x 100 = -20.39%