-17.39% is the change from 207 to 171
Calculation steps:
[( 171 - 207 ) ÷ 207] x 100 = -17.39%
Formula
Percentage change = [(171 - 207) / 207] x 100
Subtract the new number by the original number
171 - 207 = -36
-36 ÷ 207 = -0.17391304347826086
-0.17391304347826086 x 100 = -17.39%