-71.6% is the change from 81 to 23
Calculation steps:
[( 23 - 81 ) ÷ 81] x 100 = -71.6%
Formula
Percentage change = [(23 - 81) / 81] x 100
Subtract the new number by the original number
23 - 81 = -58
-58 ÷ 81 = -0.7160493827160493
-0.7160493827160493 x 100 = -71.6%