-31.49% is the change from 978 to 670
Calculation steps:
[( 670 - 978 ) ÷ 978] x 100 = -31.49%
Formula
Percentage change = [(670 - 978) / 978] x 100
Subtract the new number by the original number
670 - 978 = -308
-308 ÷ 978 = -0.3149284253578732
-0.3149284253578732 x 100 = -31.49%