636.9% is the change from 84 to 619
Calculation steps:
[( 619 - 84 ) ÷ 84] x 100 = 636.9%
Formula
Percentage change = [(619 - 84) / 84] x 100
Subtract the new number by the original number
619 - 84 = 535
535 ÷ 84 = 6.369047619047619
6.369047619047619 x 100 = 636.9%