-36.04% is the change from 813 to 520
Calculation steps:
[( 520 - 813 ) ÷ 813] x 100 = -36.04%
Formula
Percentage change = [(520 - 813) / 813] x 100
Subtract the new number by the original number
520 - 813 = -293
-293 ÷ 813 = -0.36039360393603936
-0.36039360393603936 x 100 = -36.04%