-67.25% is the change from 171 to 56
Calculation steps:
[( 56 - 171 ) ÷ 171] x 100 = -67.25%
Formula
Percentage change = [(56 - 171) / 171] x 100
Subtract the new number by the original number
56 - 171 = -115
-115 ÷ 171 = -0.672514619883041
-0.672514619883041 x 100 = -67.25%