-34.03% is the change from 817 to 539
Calculation steps:
[( 539 - 817 ) ÷ 817] x 100 = -34.03%
Formula
Percentage change = [(539 - 817) / 817] x 100
Subtract the new number by the original number
539 - 817 = -278
-278 ÷ 817 = -0.3402692778457772
-0.3402692778457772 x 100 = -34.03%