-16.31% is the change from 331 to 277
Calculation steps:
[( 277 - 331 ) ÷ 331] x 100 = -16.31%
Formula
Percentage change = [(277 - 331) / 331] x 100
Subtract the new number by the original number
277 - 331 = -54
-54 ÷ 331 = -0.16314199395770393
-0.16314199395770393 x 100 = -16.31%