-77.4% is the change from 978 to 221
Calculation steps:
[( 221 - 978 ) ÷ 978] x 100 = -77.4%
Formula
Percentage change = [(221 - 978) / 978] x 100
Subtract the new number by the original number
221 - 978 = -757
-757 ÷ 978 = -0.7740286298568507
-0.7740286298568507 x 100 = -77.4%