-69.2% is the change from 539 to 166
Calculation steps:
[( 166 - 539 ) ÷ 539] x 100 = -69.2%
Formula
Percentage change = [(166 - 539) / 539] x 100
Subtract the new number by the original number
166 - 539 = -373
-373 ÷ 539 = -0.6920222634508348
-0.6920222634508348 x 100 = -69.2%