-40.57% is the change from 663 to 394
Calculation steps:
[( 394 - 663 ) ÷ 663] x 100 = -40.57%
Formula
Percentage change = [(394 - 663) / 663] x 100
Subtract the new number by the original number
394 - 663 = -269
-269 ÷ 663 = -0.4057315233785822
-0.4057315233785822 x 100 = -40.57%