-33.53% is the change from 331 to 220
Calculation steps:
[( 220 - 331 ) ÷ 331] x 100 = -33.53%
Formula
Percentage change = [(220 - 331) / 331] x 100
Subtract the new number by the original number
220 - 331 = -111
-111 ÷ 331 = -0.33534743202416917
-0.33534743202416917 x 100 = -33.53%