-34.48% is the change from 261 to 171
Calculation steps:
[( 171 - 261 ) ÷ 261] x 100 = -34.48%
Formula
Percentage change = [(171 - 261) / 261] x 100
Subtract the new number by the original number
171 - 261 = -90
-90 ÷ 261 = -0.3448275862068966
-0.3448275862068966 x 100 = -34.48%