-0.39% is the change from 771 to 768
Calculation steps:
[( 768 - 771 ) ÷ 771] x 100 = -0.39%
Formula
Percentage change = [(768 - 771) / 771] x 100
Subtract the new number by the original number
768 - 771 = -3
-3 ÷ 771 = -0.0038910505836575876
-0.0038910505836575876 x 100 = -0.39%