-36.5% is the change from 811 to 515
Calculation steps:
[( 515 - 811 ) ÷ 811] x 100 = -36.5%
Formula
Percentage change = [(515 - 811) / 811] x 100
Subtract the new number by the original number
515 - 811 = -296
-296 ÷ 811 = -0.3649815043156597
-0.3649815043156597 x 100 = -36.5%