-9.64% is the change from 166 to 150
Calculation steps:
[( 150 - 166 ) ÷ 166] x 100 = -9.64%
Formula
Percentage change = [(150 - 166) / 166] x 100
Subtract the new number by the original number
150 - 166 = -16
-16 ÷ 166 = -0.0963855421686747
-0.0963855421686747 x 100 = -9.64%