-10.09% is the change from 912 to 820
Calculation steps:
[( 820 - 912 ) ÷ 912] x 100 = -10.09%
Formula
Percentage change = [(820 - 912) / 912] x 100
Subtract the new number by the original number
820 - 912 = -92
-92 ÷ 912 = -0.10087719298245613
-0.10087719298245613 x 100 = -10.09%