-39.27% is the change from 657 to 399
Calculation steps:
[( 399 - 657 ) ÷ 657] x 100 = -39.27%
Formula
Percentage change = [(399 - 657) / 657] x 100
Subtract the new number by the original number
399 - 657 = -258
-258 ÷ 657 = -0.3926940639269406
-0.3926940639269406 x 100 = -39.27%