-36.35% is the change from 817 to 520
Calculation steps:
[( 520 - 817 ) ÷ 817] x 100 = -36.35%
Formula
Percentage change = [(520 - 817) / 817] x 100
Subtract the new number by the original number
520 - 817 = -297
-297 ÷ 817 = -0.3635250917992656
-0.3635250917992656 x 100 = -36.35%