-49.39% is the change from 328 to 166
Calculation steps:
[( 166 - 328 ) ÷ 328] x 100 = -49.39%
Formula
Percentage change = [(166 - 328) / 328] x 100
Subtract the new number by the original number
166 - 328 = -162
-162 ÷ 328 = -0.49390243902439024
-0.49390243902439024 x 100 = -49.39%