-49.39% is the change from 164 to 83
Calculation steps:
[( 83 - 164 ) ÷ 164] x 100 = -49.39%
Formula
Percentage change = [(83 - 164) / 164] x 100
Subtract the new number by the original number
83 - 164 = -81
-81 ÷ 164 = -0.49390243902439024
-0.49390243902439024 x 100 = -49.39%