686.36% is the change from 66 to 519
Calculation steps:
[( 519 - 66 ) ÷ 66] x 100 = 686.36%
Formula
Percentage change = [(519 - 66) / 66] x 100
Subtract the new number by the original number
519 - 66 = 453
453 ÷ 66 = 6.863636363636363
6.863636363636363 x 100 = 686.36%