-16.27% is the change from 166 to 139
Calculation steps:
[( 139 - 166 ) ÷ 166] x 100 = -16.27%
Formula
Percentage change = [(139 - 166) / 166] x 100
Subtract the new number by the original number
139 - 166 = -27
-27 ÷ 166 = -0.16265060240963855
-0.16265060240963855 x 100 = -16.27%