-90.8% is the change from 859 to 79
Calculation steps:
[( 79 - 859 ) ÷ 859] x 100 = -90.8%
Formula
Percentage change = [(79 - 859) / 859] x 100
Subtract the new number by the original number
79 - 859 = -780
-780 ÷ 859 = -0.9080325960419092
-0.9080325960419092 x 100 = -90.8%