-90.07% is the change from 997 to 99
Calculation steps:
[( 99 - 997 ) ÷ 997] x 100 = -90.07%
Formula
Percentage change = [(99 - 997) / 997] x 100
Subtract the new number by the original number
99 - 997 = -898
-898 ÷ 997 = -0.9007021063189569
-0.9007021063189569 x 100 = -90.07%