97.81% is the change from 319 to 631
Calculation steps:
[( 631 - 319 ) ÷ 319] x 100 = 97.81%
Formula
Percentage change = [(631 - 319) / 319] x 100
Subtract the new number by the original number
631 - 319 = 312
312 ÷ 319 = 0.9780564263322884
0.9780564263322884 x 100 = 97.81%