-33.72% is the change from 258 to 171
Calculation steps:
[( 171 - 258 ) ÷ 258] x 100 = -33.72%
Formula
Percentage change = [(171 - 258) / 258] x 100
Subtract the new number by the original number
171 - 258 = -87
-87 ÷ 258 = -0.3372093023255814
-0.3372093023255814 x 100 = -33.72%