-16.81% is the change from 470 to 391
Calculation steps:
[( 391 - 470 ) ÷ 470] x 100 = -16.81%
Formula
Percentage change = [(391 - 470) / 470] x 100
Subtract the new number by the original number
391 - 470 = -79
-79 ÷ 470 = -0.16808510638297872
-0.16808510638297872 x 100 = -16.81%