637.35% is the change from 83 to 612
Calculation steps:
[( 612 - 83 ) ÷ 83] x 100 = 637.35%
Formula
Percentage change = [(612 - 83) / 83] x 100
Subtract the new number by the original number
612 - 83 = 529
529 ÷ 83 = 6.373493975903615
6.373493975903615 x 100 = 637.35%