-36.78% is the change from 821 to 519
Calculation steps:
[( 519 - 821 ) ÷ 821] x 100 = -36.78%
Formula
Percentage change = [(519 - 821) / 821] x 100
Subtract the new number by the original number
519 - 821 = -302
-302 ÷ 821 = -0.36784409257003653
-0.36784409257003653 x 100 = -36.78%