-0.31% is the change from 978 to 975
Calculation steps:
[( 975 - 978 ) ÷ 978] x 100 = -0.31%
Formula
Percentage change = [(975 - 978) / 978] x 100
Subtract the new number by the original number
975 - 978 = -3
-3 ÷ 978 = -0.003067484662576687
-0.003067484662576687 x 100 = -0.31%