-11.56% is the change from 173 to 153
Calculation steps:
[( 153 - 173 ) ÷ 173] x 100 = -11.56%
Formula
Percentage change = [(153 - 173) / 173] x 100
Subtract the new number by the original number
153 - 173 = -20
-20 ÷ 173 = -0.11560693641618497
-0.11560693641618497 x 100 = -11.56%