-99.01% is the change from 910 to 9
Calculation steps:
[( 9 - 910 ) ÷ 910] x 100 = -99.01%
Formula
Percentage change = [(9 - 910) / 910] x 100
Subtract the new number by the original number
9 - 910 = -901
-901 ÷ 910 = -0.9901098901098901
-0.9901098901098901 x 100 = -99.01%