-15.31% is the change from 196 to 166
Calculation steps:
[( 166 - 196 ) ÷ 196] x 100 = -15.31%
Formula
Percentage change = [(166 - 196) / 196] x 100
Subtract the new number by the original number
166 - 196 = -30
-30 ÷ 196 = -0.15306122448979592
-0.15306122448979592 x 100 = -15.31%