-15.2% is the change from 171 to 145
Calculation steps:
[( 145 - 171 ) ÷ 171] x 100 = -15.2%
Formula
Percentage change = [(145 - 171) / 171] x 100
Subtract the new number by the original number
145 - 171 = -26
-26 ÷ 171 = -0.15204678362573099
-0.15204678362573099 x 100 = -15.2%