-15.93% is the change from 979 to 823
Calculation steps:
[( 823 - 979 ) ÷ 979] x 100 = -15.93%
Formula
Percentage change = [(823 - 979) / 979] x 100
Subtract the new number by the original number
823 - 979 = -156
-156 ÷ 979 = -0.15934627170582227
-0.15934627170582227 x 100 = -15.93%