-14.21% is the change from 978 to 839
Calculation steps:
[( 839 - 978 ) ÷ 978] x 100 = -14.21%
Formula
Percentage change = [(839 - 978) / 978] x 100
Subtract the new number by the original number
839 - 978 = -139
-139 ÷ 978 = -0.14212678936605316
-0.14212678936605316 x 100 = -14.21%