-13.29% is the change from 331 to 287
Calculation steps:
[( 287 - 331 ) ÷ 331] x 100 = -13.29%
Formula
Percentage change = [(287 - 331) / 331] x 100
Subtract the new number by the original number
287 - 331 = -44
-44 ÷ 331 = -0.13293051359516617
-0.13293051359516617 x 100 = -13.29%