-89.76% is the change from 166 to 17
Calculation steps:
[( 17 - 166 ) ÷ 166] x 100 = -89.76%
Formula
Percentage change = [(17 - 166) / 166] x 100
Subtract the new number by the original number
17 - 166 = -149
-149 ÷ 166 = -0.8975903614457831
-0.8975903614457831 x 100 = -89.76%