-47.63% is the change from 317 to 166
Calculation steps:
[( 166 - 317 ) ÷ 317] x 100 = -47.63%
Formula
Percentage change = [(166 - 317) / 317] x 100
Subtract the new number by the original number
166 - 317 = -151
-151 ÷ 317 = -0.47634069400630913
-0.47634069400630913 x 100 = -47.63%