-88.55% is the change from 166 to 19
Calculation steps:
[( 19 - 166 ) ÷ 166] x 100 = -88.55%
Formula
Percentage change = [(19 - 166) / 166] x 100
Subtract the new number by the original number
19 - 166 = -147
-147 ÷ 166 = -0.8855421686746988
-0.8855421686746988 x 100 = -88.55%