-5.09% is the change from 864 to 820
Calculation steps:
[( 820 - 864 ) ÷ 864] x 100 = -5.09%
Formula
Percentage change = [(820 - 864) / 864] x 100
Subtract the new number by the original number
820 - 864 = -44
-44 ÷ 864 = -0.05092592592592592
-0.05092592592592592 x 100 = -5.09%