-51.48% is the change from 641 to 311
Calculation steps:
[( 311 - 641 ) ÷ 641] x 100 = -51.48%
Formula
Percentage change = [(311 - 641) / 641] x 100
Subtract the new number by the original number
311 - 641 = -330
-330 ÷ 641 = -0.514820592823713
-0.514820592823713 x 100 = -51.48%