-91.86% is the change from 86 to 7
Calculation steps:
[( 7 - 86 ) ÷ 86] x 100 = -91.86%
Formula
Percentage change = [(7 - 86) / 86] x 100
Subtract the new number by the original number
7 - 86 = -79
-79 ÷ 86 = -0.9186046511627907
-0.9186046511627907 x 100 = -91.86%