684.85% is the change from 66 to 518
Calculation steps:
[( 518 - 66 ) ÷ 66] x 100 = 684.85%
Formula
Percentage change = [(518 - 66) / 66] x 100
Subtract the new number by the original number
518 - 66 = 452
452 ÷ 66 = 6.848484848484849
6.848484848484849 x 100 = 684.85%