-6.06% is the change from 33 to 31
Calculation steps:
[( 31 - 33 ) ÷ 33] x 100 = -6.06%
Formula
Percentage change = [(31 - 33) / 33] x 100
Subtract the new number by the original number
31 - 33 = -2
-2 ÷ 33 = -0.06060606060606061
-0.06060606060606061 x 100 = -6.06%