-36.56% is the change from 815 to 517
Calculation steps:
[( 517 - 815 ) ÷ 815] x 100 = -36.56%
Formula
Percentage change = [(517 - 815) / 815] x 100
Subtract the new number by the original number
517 - 815 = -298
-298 ÷ 815 = -0.3656441717791411
-0.3656441717791411 x 100 = -36.56%