-4.07% is the change from 491 to 471
Calculation steps:
[( 471 - 491 ) ÷ 491] x 100 = -4.07%
Formula
Percentage change = [(471 - 491) / 491] x 100
Subtract the new number by the original number
471 - 491 = -20
-20 ÷ 491 = -0.04073319755600815
-0.04073319755600815 x 100 = -4.07%