-50.76% is the change from 331 to 163
Calculation steps:
[( 163 - 331 ) ÷ 331] x 100 = -50.76%
Formula
Percentage change = [(163 - 331) / 331] x 100
Subtract the new number by the original number
163 - 331 = -168
-168 ÷ 331 = -0.5075528700906344
-0.5075528700906344 x 100 = -50.76%