-38.55% is the change from 166 to 102
Calculation steps:
[( 102 - 166 ) ÷ 166] x 100 = -38.55%
Formula
Percentage change = [(102 - 166) / 166] x 100
Subtract the new number by the original number
102 - 166 = -64
-64 ÷ 166 = -0.3855421686746988
-0.3855421686746988 x 100 = -38.55%