-37.33% is the change from 817 to 512
Calculation steps:
[( 512 - 817 ) ÷ 817] x 100 = -37.33%
Formula
Percentage change = [(512 - 817) / 817] x 100
Subtract the new number by the original number
512 - 817 = -305
-305 ÷ 817 = -0.3733170134638923
-0.3733170134638923 x 100 = -37.33%