-76.74% is the change from 86 to 20
Calculation steps:
[( 20 - 86 ) ÷ 86] x 100 = -76.74%
Formula
Percentage change = [(20 - 86) / 86] x 100
Subtract the new number by the original number
20 - 86 = -66
-66 ÷ 86 = -0.7674418604651163
-0.7674418604651163 x 100 = -76.74%