-3.17% is the change from 978 to 947
Calculation steps:
[( 947 - 978 ) ÷ 978] x 100 = -3.17%
Formula
Percentage change = [(947 - 978) / 978] x 100
Subtract the new number by the original number
947 - 978 = -31
-31 ÷ 978 = -0.03169734151329243
-0.03169734151329243 x 100 = -3.17%