-80.12% is the change from 171 to 34
Calculation steps:
[( 34 - 171 ) ÷ 171] x 100 = -80.12%
Formula
Percentage change = [(34 - 171) / 171] x 100
Subtract the new number by the original number
34 - 171 = -137
-137 ÷ 171 = -0.8011695906432749
-0.8011695906432749 x 100 = -80.12%