-30.82% is the change from 331 to 229
Calculation steps:
[( 229 - 331 ) ÷ 331] x 100 = -30.82%
Formula
Percentage change = [(229 - 331) / 331] x 100
Subtract the new number by the original number
229 - 331 = -102
-102 ÷ 331 = -0.3081570996978852
-0.3081570996978852 x 100 = -30.82%