-77.32% is the change from 970 to 220
Calculation steps:
[( 220 - 970 ) ÷ 970] x 100 = -77.32%
Formula
Percentage change = [(220 - 970) / 970] x 100
Subtract the new number by the original number
220 - 970 = -750
-750 ÷ 970 = -0.7731958762886598
-0.7731958762886598 x 100 = -77.32%