-80.92% is the change from 477 to 91
Calculation steps:
[( 91 - 477 ) ÷ 477] x 100 = -80.92%
Formula
Percentage change = [(91 - 477) / 477] x 100
Subtract the new number by the original number
91 - 477 = -386
-386 ÷ 477 = -0.8092243186582809
-0.8092243186582809 x 100 = -80.92%