-53.01% is the change from 166 to 78
Calculation steps:
[( 78 - 166 ) ÷ 166] x 100 = -53.01%
Formula
Percentage change = [(78 - 166) / 166] x 100
Subtract the new number by the original number
78 - 166 = -88
-88 ÷ 166 = -0.5301204819277109
-0.5301204819277109 x 100 = -53.01%