-35.96% is the change from 623 to 399
Calculation steps:
[( 399 - 623 ) ÷ 623] x 100 = -35.96%
Formula
Percentage change = [(399 - 623) / 623] x 100
Subtract the new number by the original number
399 - 623 = -224
-224 ÷ 623 = -0.3595505617977528
-0.3595505617977528 x 100 = -35.96%