-51.52% is the change from 165 to 80
Calculation steps:
[( 80 - 165 ) ÷ 165] x 100 = -51.52%
Formula
Percentage change = [(80 - 165) / 165] x 100
Subtract the new number by the original number
80 - 165 = -85
-85 ÷ 165 = -0.5151515151515151
-0.5151515151515151 x 100 = -51.52%