-66.83% is the change from 817 to 271
Calculation steps:
[( 271 - 817 ) ÷ 817] x 100 = -66.83%
Formula
Percentage change = [(271 - 817) / 817] x 100
Subtract the new number by the original number
271 - 817 = -546
-546 ÷ 817 = -0.6682986536107711
-0.6682986536107711 x 100 = -66.83%