-0.2% is the change from 980 to 978
Calculation steps:
[( 978 - 980 ) ÷ 980] x 100 = -0.2%
Formula
Percentage change = [(978 - 980) / 980] x 100
Subtract the new number by the original number
978 - 980 = -2
-2 ÷ 980 = -0.0020408163265306124
-0.0020408163265306124 x 100 = -0.2%