-89.39% is the change from 66 to 7
Calculation steps:
[( 7 - 66 ) ÷ 66] x 100 = -89.39%
Formula
Percentage change = [(7 - 66) / 66] x 100
Subtract the new number by the original number
7 - 66 = -59
-59 ÷ 66 = -0.8939393939393939
-0.8939393939393939 x 100 = -89.39%