-89.09% is the change from 605 to 66
Calculation steps:
[( 66 - 605 ) ÷ 605] x 100 = -89.09%
Formula
Percentage change = [(66 - 605) / 605] x 100
Subtract the new number by the original number
66 - 605 = -539
-539 ÷ 605 = -0.8909090909090909
-0.8909090909090909 x 100 = -89.09%