-15.42% is the change from 979 to 828
Calculation steps:
[( 828 - 979 ) ÷ 979] x 100 = -15.42%
Formula
Percentage change = [(828 - 979) / 979] x 100
Subtract the new number by the original number
828 - 979 = -151
-151 ÷ 979 = -0.15423901940755874
-0.15423901940755874 x 100 = -15.42%