-87.88% is the change from 66 to 8
Calculation steps:
[( 8 - 66 ) ÷ 66] x 100 = -87.88%
Formula
Percentage change = [(8 - 66) / 66] x 100
Subtract the new number by the original number
8 - 66 = -58
-58 ÷ 66 = -0.8787878787878788
-0.8787878787878788 x 100 = -87.88%