-13.2% is the change from 197 to 171
Calculation steps:
[( 171 - 197 ) ÷ 197] x 100 = -13.2%
Formula
Percentage change = [(171 - 197) / 197] x 100
Subtract the new number by the original number
171 - 197 = -26
-26 ÷ 197 = -0.1319796954314721
-0.1319796954314721 x 100 = -13.2%