-13.6% is the change from 331 to 286
Calculation steps:
[( 286 - 331 ) ÷ 331] x 100 = -13.6%
Formula
Percentage change = [(286 - 331) / 331] x 100
Subtract the new number by the original number
286 - 331 = -45
-45 ÷ 331 = -0.13595166163141995
-0.13595166163141995 x 100 = -13.6%