-87.1% is the change from 31 to 4
Calculation steps:
[( 4 - 31 ) ÷ 31] x 100 = -87.1%
Formula
Percentage change = [(4 - 31) / 31] x 100
Subtract the new number by the original number
4 - 31 = -27
-27 ÷ 31 = -0.8709677419354839
-0.8709677419354839 x 100 = -87.1%