-22.2% is the change from 991 to 771
Calculation steps:
[( 771 - 991 ) ÷ 991] x 100 = -22.2%
Formula
Percentage change = [(771 - 991) / 991] x 100
Subtract the new number by the original number
771 - 991 = -220
-220 ÷ 991 = -0.22199798183652875
-0.22199798183652875 x 100 = -22.2%