-51.89% is the change from 663 to 319
Calculation steps:
[( 319 - 663 ) ÷ 663] x 100 = -51.89%
Formula
Percentage change = [(319 - 663) / 663] x 100
Subtract the new number by the original number
319 - 663 = -344
-344 ÷ 663 = -0.5188536953242836
-0.5188536953242836 x 100 = -51.89%