-6.43% is the change from 171 to 160
Calculation steps:
[( 160 - 171 ) ÷ 171] x 100 = -6.43%
Formula
Percentage change = [(160 - 171) / 171] x 100
Subtract the new number by the original number
160 - 171 = -11
-11 ÷ 171 = -0.06432748538011696
-0.06432748538011696 x 100 = -6.43%