-36.31% is the change from 818 to 521
Calculation steps:
[( 521 - 818 ) ÷ 818] x 100 = -36.31%
Formula
Percentage change = [(521 - 818) / 818] x 100
Subtract the new number by the original number
521 - 818 = -297
-297 ÷ 818 = -0.363080684596577
-0.363080684596577 x 100 = -36.31%