-20.79% is the change from 837 to 663
Calculation steps:
[( 663 - 837 ) ÷ 837] x 100 = -20.79%
Formula
Percentage change = [(663 - 837) / 837] x 100
Subtract the new number by the original number
663 - 837 = -174
-174 ÷ 837 = -0.2078853046594982
-0.2078853046594982 x 100 = -20.79%