-5.42% is the change from 166 to 157
Calculation steps:
[( 157 - 166 ) ÷ 166] x 100 = -5.42%
Formula
Percentage change = [(157 - 166) / 166] x 100
Subtract the new number by the original number
157 - 166 = -9
-9 ÷ 166 = -0.05421686746987952
-0.05421686746987952 x 100 = -5.42%