-36.9% is the change from 271 to 171
Calculation steps:
[( 171 - 271 ) ÷ 271] x 100 = -36.9%
Formula
Percentage change = [(171 - 271) / 271] x 100
Subtract the new number by the original number
171 - 271 = -100
-100 ÷ 271 = -0.36900369003690037
-0.36900369003690037 x 100 = -36.9%