-35.72% is the change from 809 to 520
Calculation steps:
[( 520 - 809 ) ÷ 809] x 100 = -35.72%
Formula
Percentage change = [(520 - 809) / 809] x 100
Subtract the new number by the original number
520 - 809 = -289
-289 ÷ 809 = -0.3572311495673671
-0.3572311495673671 x 100 = -35.72%