-28.14% is the change from 231 to 166
Calculation steps:
[( 166 - 231 ) ÷ 231] x 100 = -28.14%
Formula
Percentage change = [(166 - 231) / 231] x 100
Subtract the new number by the original number
166 - 231 = -65
-65 ÷ 231 = -0.2813852813852814
-0.2813852813852814 x 100 = -28.14%