-65.66% is the change from 166 to 57
Calculation steps:
[( 57 - 166 ) ÷ 166] x 100 = -65.66%
Formula
Percentage change = [(57 - 166) / 166] x 100
Subtract the new number by the original number
57 - 166 = -109
-109 ÷ 166 = -0.6566265060240963
-0.6566265060240963 x 100 = -65.66%