-37.02% is the change from 813 to 512
Calculation steps:
[( 512 - 813 ) ÷ 813] x 100 = -37.02%
Formula
Percentage change = [(512 - 813) / 813] x 100
Subtract the new number by the original number
512 - 813 = -301
-301 ÷ 813 = -0.37023370233702335
-0.37023370233702335 x 100 = -37.02%