-53.61% is the change from 166 to 77
Calculation steps:
[( 77 - 166 ) ÷ 166] x 100 = -53.61%
Formula
Percentage change = [(77 - 166) / 166] x 100
Subtract the new number by the original number
77 - 166 = -89
-89 ÷ 166 = -0.536144578313253
-0.536144578313253 x 100 = -53.61%