-0.39% is the change from 773 to 770
Calculation steps:
[( 770 - 773 ) ÷ 773] x 100 = -0.39%
Formula
Percentage change = [(770 - 773) / 773] x 100
Subtract the new number by the original number
770 - 773 = -3
-3 ÷ 773 = -0.0038809831824062097
-0.0038809831824062097 x 100 = -0.39%