-2.41% is the change from 83 to 81
Calculation steps:
[( 81 - 83 ) ÷ 83] x 100 = -2.41%
Formula
Percentage change = [(81 - 83) / 83] x 100
Subtract the new number by the original number
81 - 83 = -2
-2 ÷ 83 = -0.024096385542168676
-0.024096385542168676 x 100 = -2.41%