-4.22% is the change from 166 to 159
Calculation steps:
[( 159 - 166 ) ÷ 166] x 100 = -4.22%
Formula
Percentage change = [(159 - 166) / 166] x 100
Subtract the new number by the original number
159 - 166 = -7
-7 ÷ 166 = -0.04216867469879518
-0.04216867469879518 x 100 = -4.22%