-50.57% is the change from 971 to 480
Calculation steps:
[( 480 - 971 ) ÷ 971] x 100 = -50.57%
Formula
Percentage change = [(480 - 971) / 971] x 100
Subtract the new number by the original number
480 - 971 = -491
-491 ÷ 971 = -0.505664263645726
-0.505664263645726 x 100 = -50.57%