-80.64% is the change from 470 to 91
Calculation steps:
[( 91 - 470 ) ÷ 470] x 100 = -80.64%
Formula
Percentage change = [(91 - 470) / 470] x 100
Subtract the new number by the original number
91 - 470 = -379
-379 ÷ 470 = -0.8063829787234043
-0.8063829787234043 x 100 = -80.64%