-15.34% is the change from 978 to 828
Calculation steps:
[( 828 - 978 ) ÷ 978] x 100 = -15.34%
Formula
Percentage change = [(828 - 978) / 978] x 100
Subtract the new number by the original number
828 - 978 = -150
-150 ÷ 978 = -0.15337423312883436
-0.15337423312883436 x 100 = -15.34%