-18.43% is the change from 331 to 270
Calculation steps:
[( 270 - 331 ) ÷ 331] x 100 = -18.43%
Formula
Percentage change = [(270 - 331) / 331] x 100
Subtract the new number by the original number
270 - 331 = -61
-61 ÷ 331 = -0.18429003021148035
-0.18429003021148035 x 100 = -18.43%