-91.22% is the change from 979 to 86
Calculation steps:
[( 86 - 979 ) ÷ 979] x 100 = -91.22%
Formula
Percentage change = [(86 - 979) / 979] x 100
Subtract the new number by the original number
86 - 979 = -893
-893 ÷ 979 = -0.9121552604698672
-0.9121552604698672 x 100 = -91.22%