-89.68% is the change from 959 to 99
Calculation steps:
[( 99 - 959 ) ÷ 959] x 100 = -89.68%
Formula
Percentage change = [(99 - 959) / 959] x 100
Subtract the new number by the original number
99 - 959 = -860
-860 ÷ 959 = -0.8967674661105318
-0.8967674661105318 x 100 = -89.68%