813.64% is the change from 66 to 603
Calculation steps:
[( 603 - 66 ) ÷ 66] x 100 = 813.64%
Formula
Percentage change = [(603 - 66) / 66] x 100
Subtract the new number by the original number
603 - 66 = 537
537 ÷ 66 = 8.136363636363637
8.136363636363637 x 100 = 813.64%