-22.12% is the change from 990 to 771
Calculation steps:
[( 771 - 990 ) ÷ 990] x 100 = -22.12%
Formula
Percentage change = [(771 - 990) / 990] x 100
Subtract the new number by the original number
771 - 990 = -219
-219 ÷ 990 = -0.22121212121212122
-0.22121212121212122 x 100 = -22.12%