-37.07% is the change from 820 to 516
Calculation steps:
[( 516 - 820 ) ÷ 820] x 100 = -37.07%
Formula
Percentage change = [(516 - 820) / 820] x 100
Subtract the new number by the original number
516 - 820 = -304
-304 ÷ 820 = -0.37073170731707317
-0.37073170731707317 x 100 = -37.07%