-91.44% is the change from 666 to 57
Calculation steps:
[( 57 - 666 ) ÷ 666] x 100 = -91.44%
Formula
Percentage change = [(57 - 666) / 666] x 100
Subtract the new number by the original number
57 - 666 = -609
-609 ÷ 666 = -0.9144144144144144
-0.9144144144144144 x 100 = -91.44%