-50.87% is the change from 633 to 311
Calculation steps:
[( 311 - 633 ) ÷ 633] x 100 = -50.87%
Formula
Percentage change = [(311 - 633) / 633] x 100
Subtract the new number by the original number
311 - 633 = -322
-322 ÷ 633 = -0.5086887835703001
-0.5086887835703001 x 100 = -50.87%