-13.64% is the change from 66 to 57
Calculation steps:
[( 57 - 66 ) ÷ 66] x 100 = -13.64%
Formula
Percentage change = [(57 - 66) / 66] x 100
Subtract the new number by the original number
57 - 66 = -9
-9 ÷ 66 = -0.13636363636363635
-0.13636363636363635 x 100 = -13.64%