-20.19% is the change from 208 to 166
Calculation steps:
[( 166 - 208 ) ÷ 208] x 100 = -20.19%
Formula
Percentage change = [(166 - 208) / 208] x 100
Subtract the new number by the original number
166 - 208 = -42
-42 ÷ 208 = -0.20192307692307693
-0.20192307692307693 x 100 = -20.19%