-90.73% is the change from 939 to 87
Calculation steps:
[( 87 - 939 ) ÷ 939] x 100 = -90.73%
Formula
Percentage change = [(87 - 939) / 939] x 100
Subtract the new number by the original number
87 - 939 = -852
-852 ÷ 939 = -0.9073482428115016
-0.9073482428115016 x 100 = -90.73%