-90.19% is the change from 316 to 31
Calculation steps:
[( 31 - 316 ) ÷ 316] x 100 = -90.19%
Formula
Percentage change = [(31 - 316) / 316] x 100
Subtract the new number by the original number
31 - 316 = -285
-285 ÷ 316 = -0.9018987341772152
-0.9018987341772152 x 100 = -90.19%