-77.34% is the change from 971 to 220
Calculation steps:
[( 220 - 971 ) ÷ 971] x 100 = -77.34%
Formula
Percentage change = [(220 - 971) / 971] x 100
Subtract the new number by the original number
220 - 971 = -751
-751 ÷ 971 = -0.7734294541709578
-0.7734294541709578 x 100 = -77.34%