-89.23% is the change from 919 to 99
Calculation steps:
[( 99 - 919 ) ÷ 919] x 100 = -89.23%
Formula
Percentage change = [(99 - 919) / 919] x 100
Subtract the new number by the original number
99 - 919 = -820
-820 ÷ 919 = -0.8922742110990207
-0.8922742110990207 x 100 = -89.23%