-31.23% is the change from 317 to 218
Calculation steps:
[( 218 - 317 ) ÷ 317] x 100 = -31.23%
Formula
Percentage change = [(218 - 317) / 317] x 100
Subtract the new number by the original number
218 - 317 = -99
-99 ÷ 317 = -0.31230283911671924
-0.31230283911671924 x 100 = -31.23%