-87.93% is the change from 663 to 80
Calculation steps:
[( 80 - 663 ) ÷ 663] x 100 = -87.93%
Formula
Percentage change = [(80 - 663) / 663] x 100
Subtract the new number by the original number
80 - 663 = -583
-583 ÷ 663 = -0.8793363499245852
-0.8793363499245852 x 100 = -87.93%