709.09% is the change from 66 to 534
Calculation steps:
[( 534 - 66 ) ÷ 66] x 100 = 709.09%
Formula
Percentage change = [(534 - 66) / 66] x 100
Subtract the new number by the original number
534 - 66 = 468
468 ÷ 66 = 7.090909090909091
7.090909090909091 x 100 = 709.09%