-90.02% is the change from 912 to 91
Calculation steps:
[( 91 - 912 ) ÷ 912] x 100 = -90.02%
Formula
Percentage change = [(91 - 912) / 912] x 100
Subtract the new number by the original number
91 - 912 = -821
-821 ÷ 912 = -0.9002192982456141
-0.9002192982456141 x 100 = -90.02%