-13.89% is the change from 36 to 31
Calculation steps:
[( 31 - 36 ) ÷ 36] x 100 = -13.89%
Formula
Percentage change = [(31 - 36) / 36] x 100
Subtract the new number by the original number
31 - 36 = -5
-5 ÷ 36 = -0.1388888888888889
-0.1388888888888889 x 100 = -13.89%