-89.72% is the change from 963 to 99
Calculation steps:
[( 99 - 963 ) ÷ 963] x 100 = -89.72%
Formula
Percentage change = [(99 - 963) / 963] x 100
Subtract the new number by the original number
99 - 963 = -864
-864 ÷ 963 = -0.897196261682243
-0.897196261682243 x 100 = -89.72%