-85.71% is the change from 217 to 31
Calculation steps:
[( 31 - 217 ) ÷ 217] x 100 = -85.71%
Formula
Percentage change = [(31 - 217) / 217] x 100
Subtract the new number by the original number
31 - 217 = -186
-186 ÷ 217 = -0.8571428571428571
-0.8571428571428571 x 100 = -85.71%