-85.17% is the change from 209 to 31
Calculation steps:
[( 31 - 209 ) ÷ 209] x 100 = -85.17%
Formula
Percentage change = [(31 - 209) / 209] x 100
Subtract the new number by the original number
31 - 209 = -178
-178 ÷ 209 = -0.8516746411483254
-0.8516746411483254 x 100 = -85.17%