-85.19% is the change from 81 to 12
Calculation steps:
[( 12 - 81 ) ÷ 81] x 100 = -85.19%
Formula
Percentage change = [(12 - 81) / 81] x 100
Subtract the new number by the original number
12 - 81 = -69
-69 ÷ 81 = -0.8518518518518519
-0.8518518518518519 x 100 = -85.19%