-30.85% is the change from 577 to 399
Calculation steps:
[( 399 - 577 ) ÷ 577] x 100 = -30.85%
Formula
Percentage change = [(399 - 577) / 577] x 100
Subtract the new number by the original number
399 - 577 = -178
-178 ÷ 577 = -0.30849220103986136
-0.30849220103986136 x 100 = -30.85%