860.61% is the change from 66 to 634
Calculation steps:
[( 634 - 66 ) ÷ 66] x 100 = 860.61%
Formula
Percentage change = [(634 - 66) / 66] x 100
Subtract the new number by the original number
634 - 66 = 568
568 ÷ 66 = 8.606060606060606
8.606060606060606 x 100 = 860.61%