-90.36% is the change from 166 to 16
Calculation steps:
[( 16 - 166 ) ÷ 166] x 100 = -90.36%
Formula
Percentage change = [(16 - 166) / 166] x 100
Subtract the new number by the original number
16 - 166 = -150
-150 ÷ 166 = -0.9036144578313253
-0.9036144578313253 x 100 = -90.36%