-40.35% is the change from 171 to 102
Calculation steps:
[( 102 - 171 ) ÷ 171] x 100 = -40.35%
Formula
Percentage change = [(102 - 171) / 171] x 100
Subtract the new number by the original number
102 - 171 = -69
-69 ÷ 171 = -0.40350877192982454
-0.40350877192982454 x 100 = -40.35%