-47.59% is the change from 166 to 87
Calculation steps:
[( 87 - 166 ) ÷ 166] x 100 = -47.59%
Formula
Percentage change = [(87 - 166) / 166] x 100
Subtract the new number by the original number
87 - 166 = -79
-79 ÷ 166 = -0.4759036144578313
-0.4759036144578313 x 100 = -47.59%