-1.75% is the change from 171 to 168
Calculation steps:
[( 168 - 171 ) ÷ 171] x 100 = -1.75%
Formula
Percentage change = [(168 - 171) / 171] x 100
Subtract the new number by the original number
168 - 171 = -3
-3 ÷ 171 = -0.017543859649122806
-0.017543859649122806 x 100 = -1.75%