-36.79% is the change from 810 to 512
Calculation steps:
[( 512 - 810 ) ÷ 810] x 100 = -36.79%
Formula
Percentage change = [(512 - 810) / 810] x 100
Subtract the new number by the original number
512 - 810 = -298
-298 ÷ 810 = -0.36790123456790125
-0.36790123456790125 x 100 = -36.79%