-50.74% is the change from 672 to 331
Calculation steps:
[( 331 - 672 ) ÷ 672] x 100 = -50.74%
Formula
Percentage change = [(331 - 672) / 672] x 100
Subtract the new number by the original number
331 - 672 = -341
-341 ÷ 672 = -0.5074404761904762
-0.5074404761904762 x 100 = -50.74%