-40.88% is the change from 137 to 81
Calculation steps:
[( 81 - 137 ) ÷ 137] x 100 = -40.88%
Formula
Percentage change = [(81 - 137) / 137] x 100
Subtract the new number by the original number
81 - 137 = -56
-56 ÷ 137 = -0.40875912408759124
-0.40875912408759124 x 100 = -40.88%