-31.03% is the change from 319 to 220
Calculation steps:
[( 220 - 319 ) ÷ 319] x 100 = -31.03%
Formula
Percentage change = [(220 - 319) / 319] x 100
Subtract the new number by the original number
220 - 319 = -99
-99 ÷ 319 = -0.3103448275862069
-0.3103448275862069 x 100 = -31.03%