683.33% is the change from 66 to 517
Calculation steps:
[( 517 - 66 ) ÷ 66] x 100 = 683.33%
Formula
Percentage change = [(517 - 66) / 66] x 100
Subtract the new number by the original number
517 - 66 = 451
451 ÷ 66 = 6.833333333333333
6.833333333333333 x 100 = 683.33%