-70.33% is the change from 273 to 81
Calculation steps:
[( 81 - 273 ) ÷ 273] x 100 = -70.33%
Formula
Percentage change = [(81 - 273) / 273] x 100
Subtract the new number by the original number
81 - 273 = -192
-192 ÷ 273 = -0.7032967032967034
-0.7032967032967034 x 100 = -70.33%