-11.53% is the change from 668 to 591
Calculation steps:
[( 591 - 668 ) ÷ 668] x 100 = -11.53%
Formula
Percentage change = [(591 - 668) / 668] x 100
Subtract the new number by the original number
591 - 668 = -77
-77 ÷ 668 = -0.11526946107784432
-0.11526946107784432 x 100 = -11.53%