-0.24% is the change from 822 to 820
Calculation steps:
[( 820 - 822 ) ÷ 822] x 100 = -0.24%
Formula
Percentage change = [(820 - 822) / 822] x 100
Subtract the new number by the original number
820 - 822 = -2
-2 ÷ 822 = -0.0024330900243309003
-0.0024330900243309003 x 100 = -0.24%