-8.67% is the change from 173 to 158
Calculation steps:
[( 158 - 173 ) ÷ 173] x 100 = -8.67%
Formula
Percentage change = [(158 - 173) / 173] x 100
Subtract the new number by the original number
158 - 173 = -15
-15 ÷ 173 = -0.08670520231213873
-0.08670520231213873 x 100 = -8.67%