-71.34% is the change from 771 to 221
Calculation steps:
[( 221 - 771 ) ÷ 771] x 100 = -71.34%
Formula
Percentage change = [(221 - 771) / 771] x 100
Subtract the new number by the original number
221 - 771 = -550
-550 ÷ 771 = -0.7133592736705577
-0.7133592736705577 x 100 = -71.34%