-0.36% is the change from 823 to 820
Calculation steps:
[( 820 - 823 ) ÷ 823] x 100 = -0.36%
Formula
Percentage change = [(820 - 823) / 823] x 100
Subtract the new number by the original number
820 - 823 = -3
-3 ÷ 823 = -0.0036452004860267314
-0.0036452004860267314 x 100 = -0.36%