-21.17% is the change from 841 to 663
Calculation steps:
[( 663 - 841 ) ÷ 841] x 100 = -21.17%
Formula
Percentage change = [(663 - 841) / 841] x 100
Subtract the new number by the original number
663 - 841 = -178
-178 ÷ 841 = -0.2116527942925089
-0.2116527942925089 x 100 = -21.17%