-49.21% is the change from 317 to 161
Calculation steps:
[( 161 - 317 ) ÷ 317] x 100 = -49.21%
Formula
Percentage change = [(161 - 317) / 317] x 100
Subtract the new number by the original number
161 - 317 = -156
-156 ÷ 317 = -0.4921135646687697
-0.4921135646687697 x 100 = -49.21%