-75.58% is the change from 86 to 21
Calculation steps:
[( 21 - 86 ) ÷ 86] x 100 = -75.58%
Formula
Percentage change = [(21 - 86) / 86] x 100
Subtract the new number by the original number
21 - 86 = -65
-65 ÷ 86 = -0.7558139534883721
-0.7558139534883721 x 100 = -75.58%