-38.35% is the change from 811 to 500
Calculation steps:
[( 500 - 811 ) ÷ 811] x 100 = -38.35%
Formula
Percentage change = [(500 - 811) / 811] x 100
Subtract the new number by the original number
500 - 811 = -311
-311 ÷ 811 = -0.3834771886559803
-0.3834771886559803 x 100 = -38.35%