-39.37% is the change from 668 to 405
Calculation steps:
[( 405 - 668 ) ÷ 668] x 100 = -39.37%
Formula
Percentage change = [(405 - 668) / 668] x 100
Subtract the new number by the original number
405 - 668 = -263
-263 ÷ 668 = -0.3937125748502994
-0.3937125748502994 x 100 = -39.37%