-90.03% is the change from 311 to 31
Calculation steps:
[( 31 - 311 ) ÷ 311] x 100 = -90.03%
Formula
Percentage change = [(31 - 311) / 311] x 100
Subtract the new number by the original number
31 - 311 = -280
-280 ÷ 311 = -0.9003215434083601
-0.9003215434083601 x 100 = -90.03%