-77.24% is the change from 971 to 221
Calculation steps:
[( 221 - 971 ) ÷ 971] x 100 = -77.24%
Formula
Percentage change = [(221 - 971) / 971] x 100
Subtract the new number by the original number
221 - 971 = -750
-750 ÷ 971 = -0.772399588053553
-0.772399588053553 x 100 = -77.24%