-20.41% is the change from 833 to 663
Calculation steps:
[( 663 - 833 ) ÷ 833] x 100 = -20.41%
Formula
Percentage change = [(663 - 833) / 833] x 100
Subtract the new number by the original number
663 - 833 = -170
-170 ÷ 833 = -0.20408163265306123
-0.20408163265306123 x 100 = -20.41%