-30.54% is the change from 239 to 166
Calculation steps:
[( 166 - 239 ) ÷ 239] x 100 = -30.54%
Formula
Percentage change = [(166 - 239) / 239] x 100
Subtract the new number by the original number
166 - 239 = -73
-73 ÷ 239 = -0.3054393305439331
-0.3054393305439331 x 100 = -30.54%