-15.71% is the change from 331 to 279
Calculation steps:
[( 279 - 331 ) ÷ 331] x 100 = -15.71%
Formula
Percentage change = [(279 - 331) / 331] x 100
Subtract the new number by the original number
279 - 331 = -52
-52 ÷ 331 = -0.15709969788519637
-0.15709969788519637 x 100 = -15.71%