-9.98% is the change from 912 to 821
Calculation steps:
[( 821 - 912 ) ÷ 912] x 100 = -9.98%
Formula
Percentage change = [(821 - 912) / 912] x 100
Subtract the new number by the original number
821 - 912 = -91
-91 ÷ 912 = -0.09978070175438597
-0.09978070175438597 x 100 = -9.98%