-99.02% is the change from 921 to 9
Calculation steps:
[( 9 - 921 ) ÷ 921] x 100 = -99.02%
Formula
Percentage change = [(9 - 921) / 921] x 100
Subtract the new number by the original number
9 - 921 = -912
-912 ÷ 921 = -0.990228013029316
-0.990228013029316 x 100 = -99.02%