-31.58% is the change from 171 to 117
Calculation steps:
[( 117 - 171 ) ÷ 171] x 100 = -31.58%
Formula
Percentage change = [(117 - 171) / 171] x 100
Subtract the new number by the original number
117 - 171 = -54
-54 ÷ 171 = -0.3157894736842105
-0.3157894736842105 x 100 = -31.58%