-74.45% is the change from 317 to 81
Calculation steps:
[( 81 - 317 ) ÷ 317] x 100 = -74.45%
Formula
Percentage change = [(81 - 317) / 317] x 100
Subtract the new number by the original number
81 - 317 = -236
-236 ÷ 317 = -0.7444794952681388
-0.7444794952681388 x 100 = -74.45%