-4.83% is the change from 331 to 315
Calculation steps:
[( 315 - 331 ) ÷ 331] x 100 = -4.83%
Formula
Percentage change = [(315 - 331) / 331] x 100
Subtract the new number by the original number
315 - 331 = -16
-16 ÷ 331 = -0.04833836858006042
-0.04833836858006042 x 100 = -4.83%