-83.04% is the change from 171 to 29
Calculation steps:
[( 29 - 171 ) ÷ 171] x 100 = -83.04%
Formula
Percentage change = [(29 - 171) / 171] x 100
Subtract the new number by the original number
29 - 171 = -142
-142 ÷ 171 = -0.8304093567251462
-0.8304093567251462 x 100 = -83.04%