-52.41% is the change from 166 to 79
Calculation steps:
[( 79 - 166 ) ÷ 166] x 100 = -52.41%
Formula
Percentage change = [(79 - 166) / 166] x 100
Subtract the new number by the original number
79 - 166 = -87
-87 ÷ 166 = -0.5240963855421686
-0.5240963855421686 x 100 = -52.41%