-76.54% is the change from 81 to 19
Calculation steps:
[( 19 - 81 ) ÷ 81] x 100 = -76.54%
Formula
Percentage change = [(19 - 81) / 81] x 100
Subtract the new number by the original number
19 - 81 = -62
-62 ÷ 81 = -0.7654320987654321
-0.7654320987654321 x 100 = -76.54%