-37.61% is the change from 811 to 506
Calculation steps:
[( 506 - 811 ) ÷ 811] x 100 = -37.61%
Formula
Percentage change = [(506 - 811) / 811] x 100
Subtract the new number by the original number
506 - 811 = -305
-305 ÷ 811 = -0.376078914919852
-0.376078914919852 x 100 = -37.61%