-35.92% is the change from 813 to 521
Calculation steps:
[( 521 - 813 ) ÷ 813] x 100 = -35.92%
Formula
Percentage change = [(521 - 813) / 813] x 100
Subtract the new number by the original number
521 - 813 = -292
-292 ÷ 813 = -0.3591635916359164
-0.3591635916359164 x 100 = -35.92%