-16.99% is the change from 206 to 171
Calculation steps:
[( 171 - 206 ) ÷ 206] x 100 = -16.99%
Formula
Percentage change = [(171 - 206) / 206] x 100
Subtract the new number by the original number
171 - 206 = -35
-35 ÷ 206 = -0.16990291262135923
-0.16990291262135923 x 100 = -16.99%